Backing out changeset 5d4678e9fc37 from bug 609543 due to potentially causing bug 615736. a=backout

dom/base/nsJSEnvironment.cpp

@@ -4004,7 +4004,7 @@ SetMemoryHighWaterMarkPrefChangedCallback(const char* aPrefName, void* aClosure)
      * In the browser, we don't cap the amount of GC-owned memory.
      */
     JS_SetGCParameter(nsJSRuntime::sRuntime, JSGC_MAX_MALLOC_BYTES,
-                      80L * 1024L * 1024L);
+                      128L * 1024L * 1024L);
     JS_SetGCParameter(nsJSRuntime::sRuntime, JSGC_MAX_BYTES,
                       0xffffffff);
   } else {