Revert 132290 - Remove a dcheck I just added since I apparently don't understand the various circum…

ui/views/controls/webview/webview.cc

 // 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 "ui/views/controls/webview/webview.h"
 
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_source.h"
@@ skipping 42 matching lines @@
   wc_owner_.reset();
   web_contents_ = web_contents;
   AttachWebContents();
 }
 
 void WebView::SetFastResize(bool fast_resize) {
   wcv_holder_->set_fast_resize(fast_resize);
 }
 
 void WebView::OnWebContentsFocused(content::WebContents* web_contents) {
+  DCHECK(web_contents == web_contents_);
   FocusManager* focus_manager = GetFocusManager();
   if (focus_manager)
     focus_manager->SetFocusedView(this);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WebView, View overrides:
 
 void WebView::OnBoundsChanged(const gfx::Rect& previous_bounds) {
   wcv_holder_->SetSize(bounds().size());
@@ skipping 118 matching lines @@
   if (GetFocusManager()->GetFocusedView() == this)
     web_contents_->Focus();
 }
 
 void WebView::WebContentsDestroyed(content::WebContents* web_contents) {
   DCHECK(web_contents == web_contents_);
   SetWebContents(NULL);
 }
 
 }  // namespace views