Set the target type when creating the request for main resource

Source/core/inspector/InspectorOverlay.cpp

Index: Source/core/inspector/InspectorOverlay.cpp
diff --git a/Source/core/inspector/InspectorOverlay.cpp b/Source/core/inspector/InspectorOverlay.cpp
index 9c502b01e1512df1bee69b91ddecdca873e9bccd..8487ff746fa4381d66fb9ca765924c693dab6523 100644
--- a/Source/core/inspector/InspectorOverlay.cpp
+++ b/Source/core/inspector/InspectorOverlay.cpp
@@ -712,7 +712,9 @@ Page* InspectorOverlay::overlayPage()
     frame->view()->setTransparent(true);
 
     RefPtr<SharedBuffer> data = SharedBuffer::create(reinterpret_cast<const char*>(InspectorOverlayPage_html), sizeof(InspectorOverlayPage_html));
-    loader.load(FrameLoadRequest(0, blankURL(), SubstituteData(data, "text/html", "UTF-8", KURL(), ForceSynchronousLoad)));
+    ResourceRequest request = ResourceRequest(blankURL());
+    request.initializeForMainResource(frame->isMainFrame());
+    loader.load(FrameLoadRequest(0, request, SubstituteData(data, "text/html", "UTF-8", KURL(), ForceSynchronousLoad)));
     v8::Isolate* isolate = toIsolate(frame.get());
     ScriptState* scriptState = ScriptState::forMainWorld(frame.get());
     ASSERT(!scriptState->contextIsEmpty());