Bug 1417796 - Mark virtual methods 'override' r=mtseng

Fix warning: annotate this function with 'override' or (rarely) 'final'

MozReview-Commit-ID: GovhMo2V2q5

--HG--
extra : rebase_source : eb901d9771f7d1d1221d075f236d9b894a6d257d

layout/base/gtest/TestAccessibleCaretEventHub.cpp

@@ -112,7 +112,7 @@ public:
     mHub.get()->AddRef();
   }
 
-  ~AccessibleCaretEventHubTester()
+  ~AccessibleCaretEventHubTester() override
   {
     // Release the ref added in the constructor.
     mHub.get()->Release();

layout/base/gtest/TestAccessibleCaretManager.cpp

@@ -95,7 +95,7 @@ public:
     bool UpdateCaretsForOverlappingTilt() override { return true; }
 
     void UpdateCaretsForAlwaysTilt(nsIFrame* aStartFrame,
-                                   nsIFrame* aEndFrame)
+                                   nsIFrame* aEndFrame) override
     {
       if (mFirstCaret->IsVisuallyVisible()) {
         mFirstCaret->SetAppearance(Appearance::Left);