Remove all remaining traces of MessageLoopProxy.

chrome/test/base/testing_browser_process.cc

Index: chrome/test/base/testing_browser_process.cc
diff --git a/chrome/test/base/testing_browser_process.cc b/chrome/test/base/testing_browser_process.cc
index b92d3f4f801de4aec4e61aaa4555eeb62641fd67..aa7e02eceaa6fb9fc76727e17ef2892631b0f8c8 100644
--- a/chrome/test/base/testing_browser_process.cc
+++ b/chrome/test/base/testing_browser_process.cc
@@ -151,7 +151,7 @@ policy::BrowserPolicyConnector*
     browser_policy_connector_ = platform_part_->CreateBrowserPolicyConnector();
 
     // Note: creating the ChromeBrowserPolicyConnector invokes BrowserThread::
-    // GetMessageLoopProxyForThread(), which initializes a base::LazyInstance of
+    // GetTaskRunnerForThread(), which initializes a base::LazyInstance of
     // BrowserThreadTaskRunners. However, the threads that these task runners
     // would run tasks on are *also* created lazily and might not exist yet.
     // Creating them requires a MessageLoop, which a test can optionally create