Move the thread hop for UMA user actions from content:: to base::.

chromecast/browser/cast_browser_main_parts.cc

Index: chromecast/browser/cast_browser_main_parts.cc
diff --git a/chromecast/browser/cast_browser_main_parts.cc b/chromecast/browser/cast_browser_main_parts.cc
index ed7cd4fe7a60f1d937f0768e7aa7eb8e1aa0eacf..186793a96696af26bdb435cd99b637c82a0cd875 100644
--- a/chromecast/browser/cast_browser_main_parts.cc
+++ b/chromecast/browser/cast_browser_main_parts.cc
@@ -14,6 +14,7 @@
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
+#include "base/metrics/user_metrics.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/thread_task_runner_handle.h"
@@ -443,8 +444,11 @@ void CastBrowserMainParts::PreMainMessageLoopRun() {
   ::media::InitializeMediaLibrary();
 
   // Initializing metrics service and network delegates must happen after cast
-  // service is intialized because CastMetricsServiceClient and
+  // service is initialized because CastMetricsServiceClient and
   // CastNetworkDelegate may use components initialized by cast service.
+  base::SetRecordActionTaskRunner(
+      content::BrowserThread::GetMessageLoopProxyForThread(
+          content::BrowserThread::UI));
   cast_browser_process_->metrics_service_client()
       ->Initialize(cast_browser_process_->cast_service());
   url_request_context_factory_->InitializeNetworkDelegates();