Cleanup: Remove unused variables in chrome/ found by Scythe.

chrome/renderer/chrome_content_renderer_client.cc

 // Copyright (c) 2012 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/renderer/chrome_content_renderer_client.h"
 
 #include "base/command_line.h"
 #include "base/debug/crash_logging.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
@@ skipping 343 matching lines @@
 #endif
 }
 
 ChromeContentRendererClient::~ChromeContentRendererClient() {
   g_current_client = NULL;
 }
 
 void ChromeContentRendererClient::RenderThreadStarted() {
   RenderThread* thread = RenderThread::Get();
 
-  chrome_observer_.reset(new ChromeRenderProcessObserver(this));
+  chrome_observer_.reset(new ChromeRenderProcessObserver());
   web_cache_observer_.reset(new web_cache::WebCacheRenderProcessObserver());
 
 #if defined(ENABLE_EXTENSIONS)
   extension_dispatcher_delegate_.reset(
       new ChromeExtensionsDispatcherDelegate());
   // ChromeRenderViewTest::SetUp() creates its own ExtensionDispatcher and
   // injects it using SetExtensionDispatcher(). Don't overwrite it.
   if (!extension_dispatcher_) {
     extension_dispatcher_.reset(
         new extensions::Dispatcher(extension_dispatcher_delegate_.get()));
@@ skipping 1257 matching lines @@
   if (mime_type == content::kBrowserPluginMimeType) {
     return new extensions::ExtensionsGuestViewContainer(render_frame);
   } else {
     return new extensions::MimeHandlerViewContainer(
         render_frame, mime_type, original_url);
   }
 #else
   return NULL;
 #endif
 }