Adjust battery image assets to better align in ash tray:

Move the battery icon 1 pixel lower.
Center the battery icon and remove the special code adjustment for clipping non-centered battery icon.
Use new battery icons that aligns with battery percentage better.

BUG=172701
TBR=sky

Review URL: https://codereview.chromium.org/12259007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182255 0039d316-1c4b-4281-b951-d872f2087c98

ash/system/power/tray_power.cc

@@ -167,12 +167,10 @@ gfx::ImageSkia TrayPower::GetBatteryImage(int image_index, IconSet icon_set) {
       icon_set == ICON_DARK ?
       IDR_AURA_UBER_TRAY_POWER_SMALL_DARK : IDR_AURA_UBER_TRAY_POWER_SMALL);
 
-  // TODO(mbolohan): Remove the 2px offset when the assets are centered. See
-  // crbug.com/119832.
   gfx::Rect region(
-      ((image_index & 0x1) ? kBatteryImageWidth : 0) + 2,
+      (image_index & 0x1) ? kBatteryImageWidth : 0,
       (image_index >> 1) * kBatteryImageHeight,
-      kBatteryImageWidth - 2, kBatteryImageHeight);
+      kBatteryImageWidth, kBatteryImageHeight);
   return gfx::ImageSkiaOperations::ExtractSubset(*all.ToImageSkia(), region);
 }