Bug 1147793 - Remove unnecessary intr semantic in ipdl file. r=bent

dom/ipc/PContent.ipdl

@@ -610,8 +610,7 @@ parent:
      * This call connects the content process to a plugin process. While this
      * call runs, a new PluginModuleParent will be created in the ContentChild
      * via bridging. The corresponding PluginModuleChild will live in the plugin
-     * process. We use intr semantics here to ensure that the PluginModuleParent
-     * allocation message is dispatched before LoadPlugin returns.
+     * process.
      */
     sync LoadPlugin(uint32_t pluginId) returns (nsresult rv);
 

gfx/layers/ipc/PCompositor.ipdl

@@ -29,9 +29,7 @@ namespace layers {
  * the main thread and the compositor thread context. It's primary
  * purpose is to manage the PLayerTransaction sub protocol.
  */
-// This should really be 'sync', but we're using 'rpc' as a workaround
-// for Bug 716631.
-intr protocol PCompositor
+sync protocol PCompositor
 {
   // A Compositor manages a single Layer Manager (PLayerTransaction)
   manages PLayerTransaction;

gfx/layers/ipc/PImageBridge.ipdl

@@ -23,7 +23,7 @@ namespace layers {
  * frames directly to the compositor thread/process without relying on the main thread
  * which might be too busy dealing with content script.
  */
-intr protocol PImageBridge
+sync protocol PImageBridge
 {
   manages PCompositable;
   manages PTexture;