Standardize usage of virtual/override/final in chrome/browser/

chrome/browser/bitmap_fetcher/bitmap_fetcher.h

Index: chrome/browser/bitmap_fetcher/bitmap_fetcher.h
diff --git a/chrome/browser/bitmap_fetcher/bitmap_fetcher.h b/chrome/browser/bitmap_fetcher/bitmap_fetcher.h
index 4af30b112e49ca833b2c6342810c9ae00409c885..1d576df3c233eaad7dfd3e8f1b6e2d7090eed797 100644
--- a/chrome/browser/bitmap_fetcher/bitmap_fetcher.h
+++ b/chrome/browser/bitmap_fetcher/bitmap_fetcher.h
@@ -26,7 +26,7 @@ class BitmapFetcher : public net::URLFetcherDelegate,
                       public ImageDecoder::Delegate {
  public:
   BitmapFetcher(const GURL& url, BitmapFetcherDelegate* delegate);
-  virtual ~BitmapFetcher();
+  ~BitmapFetcher() override;
 
   const GURL& url() const { return url_; }
 
@@ -45,25 +45,25 @@ class BitmapFetcher : public net::URLFetcherDelegate,
 
   // This will be called when the URL has been fetched, successfully or not.
   // Use accessor methods on |source| to get the results.
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) override;
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   // This will be called when some part of the response is read. |current|
   // denotes the number of bytes received up to the call, and |total| is the
   // expected total size of the response (or -1 if not determined).
-  virtual void OnURLFetchDownloadProgress(const net::URLFetcher* source,
-                                          int64 current,
-                                          int64 total) override;
+  void OnURLFetchDownloadProgress(const net::URLFetcher* source,
+                                  int64 current,
+                                  int64 total) override;
 
   // Methods inherited from ImageDecoder::Delegate
 
   // Called when image is decoded. |decoder| is used to identify the image in
   // case of decoding several images simultaneously.  This will not be called
   // on the UI thread.
-  virtual void OnImageDecoded(const ImageDecoder* decoder,
-                              const SkBitmap& decoded_image) override;
+  void OnImageDecoded(const ImageDecoder* decoder,
+                      const SkBitmap& decoded_image) override;
 
   // Called when decoding image failed.
-  virtual void OnDecodeImageFailed(const ImageDecoder* decoder) override;
+  void OnDecodeImageFailed(const ImageDecoder* decoder) override;
 
  private:
   // Alerts the delegate that a failure occurred.