Move ObserverList to base namespace.

components/renderer_context_menu/render_view_context_menu_base.cc

Index: components/renderer_context_menu/render_view_context_menu_base.cc
diff --git a/components/renderer_context_menu/render_view_context_menu_base.cc b/components/renderer_context_menu/render_view_context_menu_base.cc
index 26efb960623480e98397963c4752dc6c3f1e6b48..db5f6e732d99e0a42ae2667d970be9e108243808 100644
--- a/components/renderer_context_menu/render_view_context_menu_base.cc
+++ b/components/renderer_context_menu/render_view_context_menu_base.cc
@@ -251,7 +251,8 @@ bool RenderViewContextMenuBase::IsCommandIdKnown(
     bool* enabled) const {
   // If this command is is added by one of our observers, we dispatch
   // it to the observer.
-  ObserverListBase<RenderViewContextMenuObserver>::Iterator it(&observers_);
+  base::ObserverListBase<RenderViewContextMenuObserver>::Iterator it(
+      &observers_);
   RenderViewContextMenuObserver* observer;
   while ((observer = it.GetNext()) != NULL) {
     if (observer->IsCommandIdSupported(id)) {
@@ -274,7 +275,8 @@ bool RenderViewContextMenuBase::IsCommandIdKnown(
 bool RenderViewContextMenuBase::IsCommandIdChecked(int id) const {
   // If this command is is added by one of our observers, we dispatch it to the
   // observer.
-  ObserverListBase<RenderViewContextMenuObserver>::Iterator it(&observers_);
+  base::ObserverListBase<RenderViewContextMenuObserver>::Iterator it(
+      &observers_);
   RenderViewContextMenuObserver* observer;
   while ((observer = it.GetNext()) != NULL) {
     if (observer->IsCommandIdSupported(id))
@@ -294,7 +296,8 @@ void RenderViewContextMenuBase::ExecuteCommand(int id, int event_flags) {
 
   // If this command is is added by one of our observers, we dispatch
   // it to the observer.
-  ObserverListBase<RenderViewContextMenuObserver>::Iterator it(&observers_);
+  base::ObserverListBase<RenderViewContextMenuObserver>::Iterator it(
+      &observers_);
   RenderViewContextMenuObserver* observer;
   while ((observer = it.GetNext()) != NULL) {
     if (observer->IsCommandIdSupported(id))