Revert of Enforce marking "override" for functions overriding Blink.

content/browser/android/in_process/context_provider_in_process.cc

Index: content/browser/android/in_process/context_provider_in_process.cc
diff --git a/content/browser/android/in_process/context_provider_in_process.cc b/content/browser/android/in_process/context_provider_in_process.cc
index cd9bd7d20dc38fc08ef8df8d966d79a11b0f6140..71f8010390fc96cb47e1e09449ad2680a4f860b4 100644
--- a/content/browser/android/in_process/context_provider_in_process.cc
+++ b/content/browser/android/in_process/context_provider_in_process.cc
@@ -25,11 +25,11 @@
     provider_->WebContext3DImpl()->setContextLostCallback(this);
   }
 
-  ~LostContextCallbackProxy() override {
+  virtual ~LostContextCallbackProxy() {
     provider_->WebContext3DImpl()->setContextLostCallback(NULL);
   }
 
-  void onContextLost() override {
+  virtual void onContextLost() {
     provider_->OnLostContext();
   }