FBTF: Clean up task.h in x11_util.h and header usage in some delegates.

chrome/browser/tab_contents/tab_contents_delegate.cc

 // Copyright (c) 2010 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_delegate.h"
 
+#include "gfx/rect.h"
+
 void TabContentsDelegate::DetachContents(TabContents* source) {
 }
 
 bool TabContentsDelegate::IsPopup(const TabContents* source) const {
   return false;
 }
 
 TabContents* TabContentsDelegate::GetConstrainingContents(TabContents* source) {
   return source;
 }
@@ skipping 143 matching lines @@
 }
 
 void TabContentsDelegate::UpdatePreferredSize(const gfx::Size& pref_size) {
 }
 
 void TabContentsDelegate::ContentTypeChanged(TabContents* source) {
 }
 
 TabContentsDelegate::~TabContentsDelegate() {
 }