Bug 981201 - Stop using JS_IsRunning in PreciseGCRunnable::Run and remove JS_IsRunning. r=bholley

js/src/jsapi.cpp

@@ -4881,12 +4881,6 @@ JS_RequestInterruptCallback(JSContext* cx)
     cx->requestInterrupt(JSRuntime::RequestInterruptUrgent);
 }
 
-JS_PUBLIC_API(bool)
-JS_IsRunning(JSContext* cx)
-{
-    return cx->currentlyRunning();
-}
-
 JS::AutoSetAsyncStackForNewCalls::AutoSetAsyncStackForNewCalls(
   JSContext* cx, HandleObject stack, const char* asyncCause,
   JS::AutoSetAsyncStackForNewCalls::AsyncCallKind kind)

js/src/jsapi.h

@@ -4602,13 +4602,6 @@ typedef bool
 extern JS_PUBLIC_API(void)
 SetAsyncTaskCallbacks(JSContext* cx, StartAsyncTaskCallback start, FinishAsyncTaskCallback finish);
 
-} // namespace JS
-
-extern JS_PUBLIC_API(bool)
-JS_IsRunning(JSContext* cx);
-
-namespace JS {
-
 /**
  * This class can be used to store a pointer to the youngest frame of a saved
  * stack in the specified JSContext. This reference will be picked up by any new

js/src/jscntxt.cpp

@@ -943,12 +943,6 @@ JSContext::isThrowingDebuggeeWouldRun()
            unwrappedException_.toObject().as<ErrorObject>().type() == JSEXN_DEBUGGEEWOULDRUN;
 }
 
-bool
-JSContext::currentlyRunning() const
-{
-    return !!activation();
-}
-
 static bool
 ComputeIsJITBroken()
 {

js/src/jscntxt.h

@@ -450,9 +450,6 @@ struct JSContext : public js::ExclusiveContext,
      */
     bool asyncCallIsExplicit;
 
-    /* Whether this context has JS frames on the stack. */
-    bool currentlyRunning() const;
-
     bool currentlyRunningInInterpreter() const {
         return activation()->isInterpreter();
     }

js/xpconnect/src/XPCComponents.cpp

@@ -2627,10 +2627,6 @@ class PreciseGCRunnable : public Runnable
 
     NS_IMETHOD Run() override
     {
-        JSContext* cx = dom::danger::GetJSContext();
-        if (JS_IsRunning(cx))
-            return NS_DispatchToMainThread(this);
-
         nsJSContext::GarbageCollectNow(gcreason::COMPONENT_UTILS,
                                        nsJSContext::NonIncrementalGC,
                                        mShrinking ?