Update more directories under src/ to follow C++11 style rule for {virtual,override}.

src/codec/SkCodec_libbmp.h

Index: src/codec/SkCodec_libbmp.h
diff --git a/src/codec/SkCodec_libbmp.h b/src/codec/SkCodec_libbmp.h
index a31256c0ea8977009bd81e2eba403744449c91eb..9909945c51047865cdb72c45a77cfea9125bc395 100644
--- a/src/codec/SkCodec_libbmp.h
+++ b/src/codec/SkCodec_libbmp.h
@@ -63,9 +63,9 @@ protected:
      * Initiates the bmp decode
      *
      */
-    virtual Result onGetPixels(const SkImageInfo& dstInfo, void* dst,
-                               size_t dstRowBytes, const Options&, SkPMColor*,
-                               int*) override;
+    Result onGetPixels(const SkImageInfo& dstInfo, void* dst,
+                       size_t dstRowBytes, const Options&, SkPMColor*,
+                       int*) override;
 
     SkEncodedFormat onGetEncodedFormat() const override { return kBMP_SkEncodedFormat; }