Backout bfeb3bc3da4e (bug 826029) for WINNT xpcshell failures

browser/app/nsBrowserApp.cpp

@@ -107,7 +107,6 @@ XRE_SetupDllBlocklistType XRE_SetupDllBlocklist;
 XRE_TelemetryAccumulateType XRE_TelemetryAccumulate;
 XRE_StartupTimelineRecordType XRE_StartupTimelineRecord;
 XRE_mainType XRE_main;
-XRE_DisableWritePoisoningType XRE_DisableWritePoisoning;
 
 static const nsDynamicFunctionLoad kXULFuncs[] = {
     { "XRE_GetFileFromPath", (NSFuncPtr*) &XRE_GetFileFromPath },
@@ -119,7 +118,6 @@ static const nsDynamicFunctionLoad kXULFuncs[] = {
     { "XRE_TelemetryAccumulate", (NSFuncPtr*) &XRE_TelemetryAccumulate },
     { "XRE_StartupTimelineRecord", (NSFuncPtr*) &XRE_StartupTimelineRecord },
     { "XRE_main", (NSFuncPtr*) &XRE_main },
-    { "XRE_DisableWritePoisoning", (NSFuncPtr*) &XRE_DisableWritePoisoning },
     { nullptr, nullptr }
 };
 
@@ -282,13 +280,5 @@ int main(int argc, char* argv[])
   }
 
   XPCOMGlueShutdown();
-
-  // Allow writes again. While we would like to catch writes from static
-  // destructors to allow early exits to use _exit, we know that there is
-  // at least one such write that we don't control (see bug 826029). For
-  // now we enables write again and early exits will have to use exit instead
-  // of _exit.
-  XRE_DisableWritePoisoning();
-
   return result;
 }

toolkit/xre/nsAppRunner.cpp

@@ -4080,11 +4080,6 @@ XRE_mainMetro(int argc, char* argv[], const nsXREAppData* aAppData)
 void SetWindowsEnvironment(WindowsEnvironmentType aEnvID);
 #endif // MOZ_METRO || !defined(XP_WIN)
 
-void
-XRE_DisableWritePoisoning(void) {
-  mozilla::DisableWritePoisoning();
-}
-
 int
 XRE_main(int argc, char* argv[], const nsXREAppData* aAppData, uint32_t aFlags)
 {

xpcom/build/nsXULAppAPI.h

@@ -452,8 +452,6 @@ XRE_API(void,
 XRE_API(void,
         XRE_InitOmnijar, (nsIFile* greOmni,
                           nsIFile* appOmni))
-XRE_API(void,
-        XRE_DisableWritePoisoning, (void))
 
 #ifdef XP_WIN
 /**