Const-ify RefCountedThreadSafe::AddRef and Release.

chrome/browser/chrome_plugin_unittest.cc

 // Copyright (c) 2006-2008 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.
 // Tests exercising the Chrome Plugin API.
 
 #include "base/file_util.h"
 #include "base/message_loop_proxy.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "chrome/browser/browser_thread.h"
@@ skipping 15 matching lines @@
 const char kPluginFilename[] = "test_chrome_plugin.dll";
 const int kResponseBufferSize = 4096;
 
 class TestURLRequestContextGetter : public URLRequestContextGetter {
  public:
   virtual URLRequestContext* GetURLRequestContext() {
     if (!context_)
       context_ = new TestURLRequestContext();
     return context_;
   }
-  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() {
+  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() const {
     return BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO);
   }
 
  private:
   ~TestURLRequestContextGetter() {}
   scoped_refptr<URLRequestContext> context_;
 };
 
 class ChromePluginTest : public testing::Test, public URLRequest::Delegate {
  public:
@@ skipping 250 matching lines @@
 TEST_F(ChromePluginTest, DoesNotInterceptOwnRequest) {
   const TestResponsePayload& payload = kChromeTestPluginPayloads[0];
 
   EXPECT_EQ(CPERR_SUCCESS, test_funcs_.test_make_request(
       "GET", GURL(payload.url)));
 
   MessageLoop::current()->Run();
 }
 
 }  // namespace