Print Preview: Fixing crash when hitting tab multiple times.

chrome/browser/tab_contents/tab_contents_view_gtk.cc

 // Copyright (c) 2011 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 "chrome/browser/tab_contents/tab_contents_view_gtk.h"
 
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
 
@@ skipping 251 matching lines @@
 
 void TabContentsViewGtk::UpdateDragCursor(WebDragOperation operation) {
   drag_dest_->UpdateDragStatus(operation);
 }
 
 void TabContentsViewGtk::GotFocus() {
   // This is only used in the views FocusManager stuff but it bleeds through
   // all subclasses. http://crbug.com/21875
 }
 
 // This is called when we the renderer asks us to take focus back (i.e., it has

[Lei Zhang, 2011/11/16 21:52:06]

s/when we/when /

 // iterated past the last focusable element on the page).
 void TabContentsViewGtk::TakeFocus(bool reverse) {
+  if (!tab_contents_->delegate())
+    return;
   if (!tab_contents_->delegate()->TakeFocus(reverse)) {
     gtk_widget_child_focus(GTK_WIDGET(GetTopLevelNativeWindow()),
         reverse ? GTK_DIR_TAB_BACKWARD : GTK_DIR_TAB_FORWARD);
   }
 }
 
 void TabContentsViewGtk::SetDragDestDelegate(
     content::WebDragDestDelegate* delegate) {
   drag_dest_->set_delegate(delegate);
 }
@@ skipping 121 matching lines @@
   requested_size_ = size;
 
   // We manually tell our RWHV to resize the renderer content.  This avoids
   // spurious resizes from GTK+.
   RenderWidgetHostView* rwhv = tab_contents_->GetRenderWidgetHostView();
   if (rwhv)
     rwhv->SetSize(size);
   if (tab_contents_->interstitial_page())
     tab_contents_->interstitial_page()->SetSize(size);
 }