diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index f30a2743fee4..4cfd7329bbcd 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -2698,7 +2698,7 @@ nsGlobalWindow::SetNewDocument(nsIDocument* aDocument,
     newInnerWindow->mChromeEventHandler = mChromeEventHandler;
   }
 
-  mContext->GC(JS::gcreason::SET_NEW_DOCUMENT);
+  nsJSContext::PokeGC(JS::gcreason::SET_NEW_DOCUMENT);
   mContext->DidInitializeContext();
 
   // We wait to fire the debugger hook until the window is all set up and hooked
@@ -2921,7 +2921,7 @@ nsGlobalWindow::DetachFromDocShell()
   mChromeEventHandler = nullptr; // force release now
 
   if (mContext) {
-    mContext->GC(JS::gcreason::SET_DOC_SHELL);
+    nsJSContext::PokeGC(JS::gcreason::SET_DOC_SHELL);
     mContext = nullptr;
   }
 
diff --git a/dom/base/nsIScriptContext.h b/dom/base/nsIScriptContext.h
index d2bad832ce64..a94acc2af07d 100644
--- a/dom/base/nsIScriptContext.h
+++ b/dom/base/nsIScriptContext.h
@@ -27,8 +27,8 @@ class nsIDOMWindow;
 class nsIURI;
 
 #define NS_ISCRIPTCONTEXT_IID \
-{ 0x274840b6, 0x7349, 0x4798, \
-  { 0xbe, 0x24, 0xbd, 0x75, 0xa6, 0x46, 0x99, 0xb7 } }
+{ 0x901f0d5e, 0x217a, 0x45fa, \
+  { 0x9a, 0xca, 0x45, 0x0f, 0xe7, 0x2f, 0x10, 0x9a } }
 
 class nsIOffThreadScriptReceiver;
 
@@ -67,19 +67,11 @@ public:
    */
   virtual bool IsContextInitialized() = 0;
 
-  /**
-   * For garbage collected systems, do a synchronous collection pass.
-   * May be a no-op on other systems
-   *
-   * @return NS_OK if the method is successful
-   */
-  virtual void GC(JS::gcreason::Reason aReason) = 0;
-
   // SetProperty is suspect and jst believes should not be needed.  Currenly
   // used only for "arguments".
   virtual nsresult SetProperty(JS::Handle<JSObject*> aTarget,
                                const char* aPropName, nsISupports* aVal) = 0;
-  /** 
+  /**
    * Called to set/get information if the script context is
    * currently processing a script tag
    */
@@ -134,4 +126,3 @@ public:
 NS_DEFINE_STATIC_IID_ACCESSOR(nsIOffThreadScriptReceiver, NS_IOFFTHREADSCRIPTRECEIVER_IID)
 
 #endif // nsIScriptContext_h__
-
diff --git a/dom/base/nsJSEnvironment.cpp b/dom/base/nsJSEnvironment.cpp
index fafa3d332b72..e427654b22c6 100644
--- a/dom/base/nsJSEnvironment.cpp
+++ b/dom/base/nsJSEnvironment.cpp
@@ -2302,12 +2302,6 @@ nsJSContext::KillICCTimer()
   }
 }
 
-void
-nsJSContext::GC(JS::gcreason::Reason aReason)
-{
-  PokeGC(aReason);
-}
-
 class NotifyGCEndRunnable : public nsRunnable
 {
   nsString mMessage;
diff --git a/dom/base/nsJSEnvironment.h b/dom/base/nsJSEnvironment.h
index d4ae7c33f051..d090549d3604 100644
--- a/dom/base/nsJSEnvironment.h
+++ b/dom/base/nsJSEnvironment.h
@@ -125,8 +125,6 @@ public:
   // Calling LikelyShortLivingObjectCreated() makes a GC more likely.
   static void LikelyShortLivingObjectCreated();
 
-  virtual void GC(JS::gcreason::Reason aReason) MOZ_OVERRIDE;
-
   static uint32_t CleanupsSinceLastGC();
 
   nsIScriptGlobalObject* GetCachedGlobalObject()