Add a PNGEncoder helper function that takes an SkBitmap,

chrome/browser/fav_icon_helper.cc

Index: chrome/browser/fav_icon_helper.cc
diff --git a/chrome/browser/fav_icon_helper.cc b/chrome/browser/fav_icon_helper.cc
old mode 100644
new mode 100755
index 2f5bd97d23d859481b7e44436fa1c4f1096597b5..94032b156cbc3b86ffc5eb66c8f7ab8245bf2024
--- a/chrome/browser/fav_icon_helper.cc
+++ b/chrome/browser/fav_icon_helper.cc
@@ -84,12 +84,7 @@ void FavIconHelper::SetFavIcon(
 
   if (GetHistoryService() && !profile()->IsOffTheRecord()) {
     std::vector<unsigned char> image_data;
-    SkAutoLockPixels icon_lock(sized_image);
-    PNGEncoder::Encode(
-        reinterpret_cast<unsigned char*>(sized_image.getPixels()),
-        PNGEncoder::FORMAT_BGRA, sized_image.width(),
-        sized_image.height(), sized_image.width()* 4, false,
-        &image_data);
+    PNGEncoder::EncodeBGRASkBitmap(sized_image, false, &image_data);
     GetHistoryService()->SetFavIcon(i->second.url, i->second.fav_icon_url,
                                     image_data);
   }