Added default implementations of GetAcceleratorForCommandId.

chrome/browser/apps/app_browsertest.cc

Index: chrome/browser/apps/app_browsertest.cc
diff --git a/chrome/browser/apps/app_browsertest.cc b/chrome/browser/apps/app_browsertest.cc
index f6f699eee4529e47754b1ab660c045d3de1d628e..146fb768c6d279076838d8469c4527284b9b8c65 100644
--- a/chrome/browser/apps/app_browsertest.cc
+++ b/chrome/browser/apps/app_browsertest.cc
@@ -86,13 +86,6 @@ class PlatformAppContextMenu : public RenderViewContextMenu {
   }
 
   void Show() override {}
-
- protected:
-  // RenderViewContextMenu implementation.
-  bool GetAcceleratorForCommandId(int command_id,
-                                  ui::Accelerator* accelerator) const override {
-    return false;
-  }
 };
 
 // This class keeps track of tabs as they are added to the browser. It will be