Remove usage of base::ObserverList<T>::Iter::GetNext() in //content.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 674728838d4c7781a32a7ab2893c5970e078514b..1e682e733d1be98813dbf845f23bc1c271b1249d 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -675,16 +675,16 @@ bool WebContentsImpl::OnMessageReceived(RenderViewHost* render_view_host,
     return true;
   }
 
-  base::ObserverListBase<WebContentsObserver>::Iterator it(&observers_);
-  WebContentsObserver* observer;
   if (render_frame_host) {
-    while ((observer = it.GetNext()) != NULL)
-      if (observer->OnMessageReceived(message, render_frame_host))
+    for (auto& observer : observers_) {
+      if (observer.OnMessageReceived(message, render_frame_host))
         return true;
+    }
   } else {
-    while ((observer = it.GetNext()) != NULL)
-      if (observer->OnMessageReceived(message))
+    for (auto& observer : observers_) {
+      if (observer.OnMessageReceived(message))
         return true;
+    }
   }
 
   // Message handlers should be aware of which