fix newly added OVERRIDE in profile_impl_io_data.h

BUG=417463

Review URL: https://codereview.chromium.org/653583002

Cr-Commit-Position: refs/heads/master@{#299285}

chrome/browser/profiles/profile_impl_io_data.h

@@ -149,7 +149,7 @@ class ProfileImplIOData : public ProfileIOData {
     DISALLOW_COPY_AND_ASSIGN(Handle);
   };
 
-  virtual bool IsDataReductionProxyEnabled() const OVERRIDE;
+  virtual bool IsDataReductionProxyEnabled() const override;
 
   BooleanPrefMember* data_reduction_proxy_enabled() const {
     return &data_reduction_proxy_enabled_;