# HG changeset patch
# Parent f9585cefcf568dbc2a6ce81f16a2048365af7ed2

diff --git a/content/canvas/test/webgl/conformance/extensions/oes-standard-derivatives.html b/content/canvas/test/webgl/conformance/extensions/oes-standard-derivatives.html
--- a/content/canvas/test/webgl/conformance/extensions/oes-standard-derivatives.html
+++ b/content/canvas/test/webgl/conformance/extensions/oes-standard-derivatives.html
@@ -337,42 +337,21 @@ function runOutputTests() {
     setupBuffers(1.0, 0.5, 0.5, 0.0);
     wtu.drawQuad(gl);
     expectResult([3, 3, 5, 255],
                  "Draw 4 (variation in x & y) returned the correct data",
                  "Draw 4 (variation in x & y) returned incorrect data");
 
 }
 
-function attemptToForceGC()
-{
-    var holderArray = [];
-    var tempArray;
-    window.tempArray = holderArray;
-    for (var i = 0; i < 12; ++i) {
-        tempArray = [];
-        for (var j = 0; j < 1024 * 1024; ++j) {
-            tempArray.push(0);
-        }
-        holderArray.push(tempArray);
-    }
-    window.tempArray = null;
-}
-
 function runUniqueObjectTest()
 {
     debug("Testing that getExtension() returns the same object each time");
     gl.getExtension("OES_standard_derivatives").myProperty = 2;
-    if (window.GCController) {
-        window.GCController.collect();
-    } else if (window.opera && window.opera.collect) {
-        window.opera.collect();
-    } else {
-        attemptToForceGC();
-    }
+    gc();
     shouldBe('gl.getExtension("OES_standard_derivatives").myProperty', '2');
 }
 
 function runReferenceCycleTest()
 {
     // create some reference cycles. The goal is to see if they cause leaks. The point is that
     // some browser test runners have instrumentation to detect leaked refcounted objects.
 
diff --git a/content/canvas/test/webgl/conformance/extensions/oes-texture-float.html b/content/canvas/test/webgl/conformance/extensions/oes-texture-float.html
--- a/content/canvas/test/webgl/conformance/extensions/oes-texture-float.html
+++ b/content/canvas/test/webgl/conformance/extensions/oes-texture-float.html
@@ -178,42 +178,21 @@ function runRenderTargetTest(testProgram
     gl.bindTexture(gl.TEXTURE_2D, texture);
     gl.useProgram(testProgram);
     gl.uniform1i(gl.getUniformLocation(testProgram, "tex"), 0);
     wtu.drawQuad(gl);
     glErrorShouldBe(gl, gl.NO_ERROR, "rendering from floating-point texture should succeed");
     checkRenderingResults();
 }
 
-function attemptToForceGC()
-{
-    var holderArray = [];
-    var tempArray;
-    window.tempArray = holderArray;
-    for (var i = 0; i < 12; ++i) {
-        tempArray = [];
-        for (var j = 0; j < 1024 * 1024; ++j) {
-            tempArray.push(0);
-        }
-        holderArray.push(tempArray);
-    }
-    window.tempArray = null;
-}
-
 function runUniqueObjectTest()
 {
     debug("Testing that getExtension() returns the same object each time");
     gl.getExtension("OES_texture_float").myProperty = 2;
-    if (window.GCController) {
-        window.GCController.collect();
-    } else if (window.opera && window.opera.collect) {
-        window.opera.collect();
-    } else {
-        attemptToForceGC();
-    }
+    gc();
     shouldBe('gl.getExtension("OES_texture_float").myProperty', '2');
 }
 
 function runReferenceCycleTest()
 {
     // create some reference cycles. The goal is to see if they cause leaks. The point is that
     // some browser test runners have instrumentation to detect leaked refcounted objects.
 
diff --git a/content/canvas/test/webgl/resources/js-test-pre.js b/content/canvas/test/webgl/resources/js-test-pre.js
--- a/content/canvas/test/webgl/resources/js-test-pre.js
+++ b/content/canvas/test/webgl/resources/js-test-pre.js
@@ -435,29 +435,42 @@ function assertMsg(assertion, msg) {
     if (assertion) {
         testPassed(msg);
     } else {
         testFailed(msg);
     }
 }
 
 function gc() {
-    if (typeof GCController !== "undefined")
-        GCController.collect();
-    else {
-        function gcRec(n) {
-            if (n < 1)
-                return {};
-            var temp = {i: "ab" + i + (i / 100000)};
-            temp += "foo";
-            gcRec(n-1);
-        }
-        for (var i = 0; i < 1000; i++)
-            gcRec(10)
+    if (window.GCController) {
+        window.GCController.collect();
+        return;
     }
+
+    if (window.opera && window.opera.collect) {
+        window.opera.collect();
+        return;
+    }
+
+    try {
+        window.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
+              .getInterface(Components.interfaces.nsIDOMWindowUtils)
+              .garbageCollect();
+        return;
+    } catch(e) {}
+
+    function gcRec(n) {
+        if (n < 1)
+            return {};
+        var temp = {i: "ab" + i + (i / 100000)};
+        temp += "foo";
+        gcRec(n-1);
+    }
+    for (var i = 0; i < 1000; i++)
+        gcRec(10);
 }
 
 function finishTest() {
   successfullyParsed = true;
   var epilogue = document.createElement("script");
   epilogue.onload = function() {
     if (window.nonKhronosFrameworkNotifyDone) {
       window.nonKhronosFrameworkNotifyDone();