Revert of Bind Window focus ability to the ExecutionContext instead of the process.

Source/core/frame/LocalDOMWindow.cpp

Index: Source/core/frame/LocalDOMWindow.cpp
diff --git a/Source/core/frame/LocalDOMWindow.cpp b/Source/core/frame/LocalDOMWindow.cpp
index a8c7f5c59251eedb3712d86b8bbe7b854872f388..926de144193cf533bef0b4ef1472bf2137363d95 100644
--- a/Source/core/frame/LocalDOMWindow.cpp
+++ b/Source/core/frame/LocalDOMWindow.cpp
@@ -976,19 +976,20 @@
     if (!host)
         return;
 
-    ASSERT(context);
-
-    bool allowFocus = context->isWindowFocusAllowed();
-    if (allowFocus) {
-        context->consumeWindowFocus();
-    } else {
+    bool allowFocus = WindowFocusAllowedIndicator::windowFocusAllowed();
+    if (context) {
         ASSERT(isMainThread());
-        allowFocus = opener() && (opener() != this) && (toDocument(context)->domWindow() == opener());
+        Document* activeDocument = toDocument(context);
+        if (opener() && opener() != this && activeDocument->domWindow() == opener())
+            allowFocus = true;
     }
 
     // If we're a top level window, bring the window to the front.
     if (frame()->isMainFrame() && allowFocus)
         host->chrome().focus();
+
+    if (!frame())
+        return;
 
     frame()->eventHandler().focusDocumentView();
 }