Bug 906372 - Fix NULL deref when finishing off thread parse tasks which failed, r=billm.

js/src/jsapi.cpp

@@ -4893,7 +4893,7 @@ JS::FinishOffThreadScript(JSRuntime *rt, JSScript *script)
 {
 #if defined(JS_THREADSAFE) && defined(JS_ION)
     JS_ASSERT(CurrentThreadCanAccessRuntime(rt));
-    rt->workerThreadState->finishParseTaskForScript(script);
+    rt->workerThreadState->finishParseTaskForScript(rt, script);
 #else
     MOZ_ASSUME_UNREACHABLE("Off thread compilation is only available with JS_ION");
 #endif

js/src/jsworkers.cpp

@@ -481,9 +481,8 @@ WorkerThreadState::canStartParseTask()
 }
 
 void
-WorkerThreadState::finishParseTaskForScript(JSScript *script)
+WorkerThreadState::finishParseTaskForScript(JSRuntime *rt, JSScript *script)
 {
-    JSRuntime *rt = script->compartment()->runtimeFromMainThread();
     ParseTask *parseTask = NULL;
 
     {

js/src/jsworkers.h

@@ -115,7 +115,7 @@ class WorkerThreadState
         return asmJSFailedFunction;
     }
 
-    void finishParseTaskForScript(JSScript *script);
+    void finishParseTaskForScript(JSRuntime *rt, JSScript *script);
 
   private: