Split infobar_delegate.[cc,h] into separate pieces for the different classes defined within, so that

chrome/browser/ui/gtk/infobars/link_infobar_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/ui/gtk/infobars/link_infobar_gtk.h"
 
-#include "chrome/browser/tab_contents/infobar_delegate.h"
+#include "chrome/browser/tab_contents/link_infobar_delegate.h"
 #include "chrome/browser/ui/gtk/gtk_util.h"
 
 // LinkInfoBarDelegate ---------------------------------------------------------
 
 InfoBar* LinkInfoBarDelegate::CreateInfoBar() {
   return new LinkInfoBarGtk(this);
 }
 
 // LinkInfoBarGtk --------------------------------------------------------------
 
@@ skipping 12 matching lines @@
 void LinkInfoBarGtk::OnLinkClicked(GtkWidget* button) {
   if (GetDelegate()->LinkClicked(
         gtk_util::DispositionForCurrentButtonPressEvent())) {
     RemoveInfoBar();
   }
 }
 
 LinkInfoBarDelegate* LinkInfoBarGtk::GetDelegate() {
   return delegate_->AsLinkInfoBarDelegate();
 }