[CLEANUP] Rename some methods of ExtensionToolbarModel to be OnFoo

chrome/browser/ui/toolbar/toolbar_actions_bar.h

Index: chrome/browser/ui/toolbar/toolbar_actions_bar.h
diff --git a/chrome/browser/ui/toolbar/toolbar_actions_bar.h b/chrome/browser/ui/toolbar/toolbar_actions_bar.h
index 989702044c6d47c121dff16c18610ddd9d3bf294..f7300a0604e234bfd5899b3ab660abf266ffaf6c 100644
--- a/chrome/browser/ui/toolbar/toolbar_actions_bar.h
+++ b/chrome/browser/ui/toolbar/toolbar_actions_bar.h
@@ -149,16 +149,18 @@ class ToolbarActionsBar : public extensions::ExtensionToolbarModel::Observer {
   using ToolbarActions = ScopedVector<ToolbarActionViewController>;
 
   // ExtensionToolbarModel::Observer:
-  void ToolbarExtensionAdded(const extensions::Extension* extension,
-                             int index) override;
-  void ToolbarExtensionRemoved(const extensions::Extension* extension) override;
-  void ToolbarExtensionMoved(const extensions::Extension* extension,
-                             int index) override;
-  void ToolbarExtensionUpdated(const extensions::Extension* extension) override;
+  void OnToolbarExtensionAdded(const extensions::Extension* extension,
+                               int index) override;
+  void OnToolbarExtensionRemoved(
+      const extensions::Extension* extension) override;
+  void OnToolbarExtensionMoved(const extensions::Extension* extension,
+                               int index) override;
+  void OnToolbarExtensionUpdated(
+      const extensions::Extension* extension) override;
   bool ShowExtensionActionPopup(const extensions::Extension* extension,
                                 bool grant_active_tab) override;
-  void ToolbarVisibleCountChanged() override;
-  void ToolbarHighlightModeChanged(bool is_highlighting) override;
+  void OnToolbarVisibleCountChanged() override;
+  void OnToolbarHighlightModeChanged(bool is_highlighting) override;
   void OnToolbarModelInitialized() override;
   Browser* GetBrowser() override;