Reland: Do not initialize v8::Context on |ScriptController::updateDocument|.

Source/bindings/v8/ScriptController.cpp

Index: Source/bindings/v8/ScriptController.cpp
diff --git a/Source/bindings/v8/ScriptController.cpp b/Source/bindings/v8/ScriptController.cpp
index 62146cf8e3f97726693078c9903832c0800bc74f..6140e4c770d091f7879962d80ef20ed030668ff0 100644
--- a/Source/bindings/v8/ScriptController.cpp
+++ b/Source/bindings/v8/ScriptController.cpp
@@ -473,8 +473,8 @@ int ScriptController::contextDebugId(v8::Handle<v8::Context> context)
 
 void ScriptController::updateDocument()
 {
-    // For an uninitialized main window shell, do not incur the cost of context initialization during FrameLoader::init().
-    if ((!m_windowShell->isContextInitialized() || !m_windowShell->isGlobalInitialized()) && m_frame->loader().stateMachine()->creatingInitialEmptyDocument())
+    // For an uninitialized main window shell, do not incur the cost of context initialization.
+    if (!m_windowShell->isGlobalInitialized())
         return;
 
     if (!initializeMainWorld())