Revert 186849 "Bind Window focus ability to the ExecutionContext..."

Source/core/frame/LocalDOMWindow.cpp

Index: Source/core/frame/LocalDOMWindow.cpp
===================================================================
--- Source/core/frame/LocalDOMWindow.cpp	(revision 187183)
+++ Source/core/frame/LocalDOMWindow.cpp	(working copy)
@@ -976,14 +976,12 @@
     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.
@@ -990,6 +988,9 @@
     if (frame()->isMainFrame() && allowFocus)
         host->chrome().focus();
 
+    if (!frame())
+        return;
+
     frame()->eventHandler().focusDocumentView();
 }