Fix crash in Linux extension shelf.

chrome/browser/extensions/extension_host.cc

 // Copyright (c) 2006-2009 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_host.h"
 
 #include "app/resource_bundle.h"
 #include "base/string_util.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/browser_list.h"
@@ skipping 45 matching lines @@
   render_view_host_->Shutdown();  // deletes render_view_host
 }
 
 void ExtensionHost::CreateView(Browser* browser) {
 #if defined(TOOLKIT_VIEWS)
   view_.reset(new ExtensionView(this, browser));
   // We own |view_|, so don't auto delete when it's removed from the view
   // hierarchy.
   view_->SetParentOwned(false);
 #elif defined(OS_LINUX)
-  view_.reset(new ExtensionViewGtk(this));
+  view_.reset(new ExtensionViewGtk(this, browser));
+  view_->Init();
 #else
   // TODO(port)
   NOTREACHED();
 #endif
 }
 
 RenderProcessHost* ExtensionHost::render_process_host() const {
   return render_view_host_->process();
 }
 
@@ skipping 214 matching lines @@
 }
 
 void ExtensionHost::HandleMouseLeave() {
 #if defined(OS_WIN)
   if (view_.get())
     view_->HandleMouseLeave();
 #endif
 }
 
 Browser* ExtensionHost::GetBrowser() {
-#if defined(OS_WIN)
+#if defined(OS_WIN) || defined(OS_LINUX)
   if (view_.get())
     return view_->browser();
 #endif
   Browser* browser = BrowserList::GetLastActiveWithProfile(
       render_view_host()->process()->profile());
   // NOTE(rafaelw): This can return NULL in some circumstances. In particular,
   // a toolstrip or background_page onload chrome.tabs api call can make it
   // into here before the browser is sufficiently initialized to return here.
   // A similar situation may arise during shutdown.
   // TODO(rafaelw): Delay creation of background_page until the browser
@@ skipping 20 matching lines @@
     window_id = ExtensionTabUtil::GetWindowId(
         const_cast<ExtensionHost* >(this)->GetBrowser());
   } else if (extension_host_type_ == ViewType::EXTENSION_BACKGROUND_PAGE) {
     // Background page is not attached to any browser window, so pass -1.
     window_id = -1;
   } else {
     NOTREACHED();
   }
   return window_id;
 }