Remove all remaining traces of MessageLoopProxy.

chrome/browser/extensions/api/declarative/declarative_apitest.cc

Index: chrome/browser/extensions/api/declarative/declarative_apitest.cc
diff --git a/chrome/browser/extensions/api/declarative/declarative_apitest.cc b/chrome/browser/extensions/api/declarative/declarative_apitest.cc
index 810b4df4f03966127551183fe79ad685a7ac8ec8..68f7410f909cdf5e8be520c53b2707b6fddbda63 100644
--- a/chrome/browser/extensions/api/declarative/declarative_apitest.cc
+++ b/chrome/browser/extensions/api/declarative/declarative_apitest.cc
@@ -123,7 +123,7 @@ class DeclarativeApiTest : public ExtensionApiTest {
         base::Bind(
             &RulesRegistry::GetAllRules, rules_registry, extension_id, &rules));
     scoped_refptr<base::ThreadTestHelper> io_helper(new base::ThreadTestHelper(
-        BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO).get()));
+        BrowserThread::GetTaskRunnerForThread(BrowserThread::IO).get()));
     EXPECT_TRUE(io_helper->Run());
     return rules.size();
   }