Do not send blur to the original window when JS popup shows.

content/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <Carbon/Carbon.h>
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
@@ skipping 1603 matching lines @@
 
 void RenderWidgetHostViewMac::ShutdownHost() {
   weak_factory_.InvalidateWeakPtrs();
   render_widget_host_->ShutdownAndDestroyWidget(true);
   // Do not touch any members at this point, |this| has been deleted.
 }
 
 void RenderWidgetHostViewMac::SetActive(bool active) {
   if (render_widget_host_) {
     render_widget_host_->SetActive(active);
-    if (active) {
-      if (HasFocus())
-        render_widget_host_->Focus();
-    } else {
-      render_widget_host_->Blur();
-    }
   }
   if (HasFocus())
     SetTextInputActive(active);
   if (!active)
     UnlockMouse();
 }
 
 void RenderWidgetHostViewMac::ShowDefinitionForSelection() {
   RenderWidgetHostViewMacDictionaryHelper helper(this);
   helper.ShowDefinitionForSelection();
@@ skipping 1833 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end