Replace Context::Scope with ScriptState::Scope

Source/web/WebDevToolsFrontendImpl.cpp

Index: Source/web/WebDevToolsFrontendImpl.cpp
diff --git a/Source/web/WebDevToolsFrontendImpl.cpp b/Source/web/WebDevToolsFrontendImpl.cpp
index a11c33c96bfa6e6d7a544dff050eddc41b0a6950..a2f47f9fab8664d615d22cb14a15451cedbd3b06 100644
--- a/Source/web/WebDevToolsFrontendImpl.cpp
+++ b/Source/web/WebDevToolsFrontendImpl.cpp
@@ -137,12 +137,9 @@ void WebDevToolsFrontendImpl::doDispatchOnInspectorFrontend(const WebString& mes
     if (!frame->frame())
         return;
     v8::Isolate* isolate = toIsolate(frame->frame());
-    v8::HandleScope scope(isolate);
-    v8::Handle<v8::Context> frameContext = toV8Context(frame->frame(), DOMWrapperWorld::mainWorld());
-    if (frameContext.IsEmpty())
-        return;
-    v8::Context::Scope contextScope(frameContext);
-    v8::Handle<v8::Value> inspectorFrontendApiValue = frameContext->Global()->Get(v8::String::NewFromUtf8(isolate, "InspectorFrontendAPI"));
+    ScriptState* scriptState = ScriptState::forMainWorld(frame->frame());
+    ScriptState::Scope scope(scriptState);
+    v8::Handle<v8::Value> inspectorFrontendApiValue = scriptState->context()->Global()->Get(v8::String::NewFromUtf8(isolate, "InspectorFrontendAPI"));
     if (!inspectorFrontendApiValue->IsObject())
         return;
     v8::Handle<v8::Object> dispatcherObject = v8::Handle<v8::Object>::Cast(inspectorFrontendApiValue);
@@ -151,7 +148,7 @@ void WebDevToolsFrontendImpl::doDispatchOnInspectorFrontend(const WebString& mes
     // OR the older version of frontend might have a dispatch method in a different place.
     // FIXME(kaznacheev): Remove when Chrome for Android M18 is retired.
     if (!dispatchFunction->IsFunction()) {
-        v8::Handle<v8::Value> inspectorBackendApiValue = frameContext->Global()->Get(v8::String::NewFromUtf8(isolate, "InspectorBackend"));
+        v8::Handle<v8::Value> inspectorBackendApiValue = scriptState->context()->Global()->Get(v8::String::NewFromUtf8(isolate, "InspectorBackend"));
         if (!inspectorBackendApiValue->IsObject())
             return;
         dispatcherObject = v8::Handle<v8::Object>::Cast(inspectorBackendApiValue);