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

ios/web/user_metrics.cc

Index: ios/web/user_metrics.cc
diff --git a/ios/web/user_metrics.cc b/ios/web/user_metrics.cc
index b6ac484e6a7454b15aa60699725fa86625b3ecec..acb426d8487eef6dd4a546d4aa023c97e78bad48 100644
--- a/ios/web/user_metrics.cc
+++ b/ios/web/user_metrics.cc
@@ -13,23 +13,13 @@
 
 namespace web {
 
+// TODO(beaudoin): Get rid of these methods now that the base:: version does
+// thread hopping. Tracked in crbug.com/601483.
 void RecordAction(const base::UserMetricsAction& action) {
-  if (!WebThread::CurrentlyOn(WebThread::UI)) {
-    WebThread::PostTask(WebThread::UI, FROM_HERE,
-                        base::Bind(&web::RecordAction, action));
-    return;
-  }
-
   base::RecordAction(action);
 }
 
 void RecordComputedAction(const std::string& action) {
-  if (!WebThread::CurrentlyOn(WebThread::UI)) {
-    WebThread::PostTask(WebThread::UI, FROM_HERE,
-                        base::Bind(&web::RecordComputedAction, action));
-    return;
-  }
-
   base::RecordComputedAction(action);
 }