Delete the GTK+ port of Chrome.

chrome/browser/extensions/extension_view_host.cc

 // Copyright 2013 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/extensions/extension_view_host.h"
 
 #include "base/strings/string_piece.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/window_controller.h"
 #include "chrome/browser/file_select_helper.h"
@@ skipping 67 matching lines @@
 
 void ExtensionViewHost::CreateView(Browser* browser) {
 #if defined(TOOLKIT_VIEWS)
   view_.reset(new ExtensionViewViews(this, browser));
   // We own |view_|, so don't auto delete when it's removed from the view
   // hierarchy.
   view_->set_owned_by_client();
 #elif defined(OS_MACOSX)
   view_.reset(new ExtensionViewMac(this, browser));
   view_->Init();
-#elif defined(TOOLKIT_GTK)
-  view_.reset(new ExtensionViewGtk(this, browser));
-  view_->Init();
 #else
   // TODO(port)
   NOTREACHED();
 #endif
 }
 
 void ExtensionViewHost::SetAssociatedWebContents(WebContents* web_contents) {
   associated_web_contents_ = web_contents;
   if (associated_web_contents_) {
     // Observe the new WebContents for deletion.
@@ skipping 239 matching lines @@
 
 void ExtensionViewHost::InsertInfobarCSS() {
   static const base::StringPiece css(
       ResourceBundle::GetSharedInstance().GetRawDataResource(
       IDR_EXTENSIONS_INFOBAR_CSS));
 
   host_contents()->InsertCSS(css.as_string());
 }
 
 }  // namespace extensions