Change SetImage, SetBackground, and SetToggledImage to take in a gfx::ImageSkia

ash/system/audio/tray_volume.cc

Index: ash/system/audio/tray_volume.cc
diff --git a/ash/system/audio/tray_volume.cc b/ash/system/audio/tray_volume.cc
index b43f1218deff505379c7f30501f6e70e853dd043..fba2fe871c0c8307da27b1e97d94558d5f3ab7f9 100644
--- a/ash/system/audio/tray_volume.cc
+++ b/ash/system/audio/tray_volume.cc
@@ -69,9 +69,9 @@ class VolumeButton : public views::ToggleImageButton {
     if (image_index != image_index_) {
       SkIRect region = SkIRect::MakeXYWH(0, image_index * kVolumeImageHeight,
           kVolumeImageWidth, kVolumeImageHeight);
-      SkBitmap bitmap;
-      image_.ToSkBitmap()->extractSubset(&bitmap, region);
-      SetImage(views::CustomButton::BS_NORMAL, &bitmap);
+      gfx::ImageSkia image_skia;
+      image_.ToImageSkia()->extractSubset(&image_skia, region);
+      SetImage(views::CustomButton::BS_NORMAL, &image_skia);
       image_index_ = image_index;
     }
     SchedulePaint();