Apply MD style to Linux avatar buttons.

chrome/app/theme/theme_resources.grd

 <?xml version="1.0" encoding="utf-8"?>
 <!-- This grd file contains images that are pre-scaled for device scale
      factors. The image returned by |base::ResourceBundle::GetImageNamed|
      will contain multiple |gfx:ImageSkiaReps| for each scale factors. The
      |fallback_to_low_resolution| attribute controls behavior when
      an image file is missing for target scale factor. If true, chrome
      will automatically scale the 1x image to the target scale factor.
      If false, build will fail due to missing resources. This is
      currently set to true for all resources, but the default will
      become false in near future.
@@ skipping 315 matching lines @@
       <structure type="chrome_scaled_image" name="IDR_PROFILE_AVATAR_20" file="common/profile_avatar_cupcake.png" />
       <structure type="chrome_scaled_image" name="IDR_PROFILE_AVATAR_21" file="common/profile_avatar_dog.png" />
       <structure type="chrome_scaled_image" name="IDR_PROFILE_AVATAR_22" file="common/profile_avatar_horse.png" />
       <structure type="chrome_scaled_image" name="IDR_PROFILE_AVATAR_23" file="common/profile_avatar_margarita.png" />
       <structure type="chrome_scaled_image" name="IDR_PROFILE_AVATAR_24" file="common/profile_avatar_note.png" />
       <structure type="chrome_scaled_image" name="IDR_PROFILE_AVATAR_25" file="common/profile_avatar_sun_cloud.png" />
       <structure type="chrome_scaled_image" name="IDR_PROFILE_AVATAR_26" file="common/profile_avatar_placeholder.png" />
       <structure type="chrome_scaled_image" name="IDR_PROFILE_AVATAR_PLACEHOLDER_LARGE" file="common/profile_avatar_placeholder_large.png" />
 
       <!-- New style avatar button -->
-      <if expr="toolkit_views and not is_macosx">
+      <if expr="is_win">

[Lei Zhang, 2017/09/13 07:37:34]

This doesn't match the C++ code. The IDR_AVATAR_THEMED usage in avatar_button.cc
is not inside a #if defined(OS_WIN) conditional. This only works because
output_all_resource_defines defaults to true and
output_all_resource_defines="false" isn't set. See bug 627301.

         <!-- Windows, themed -->
         <structure type="chrome_scaled_image" name="IDR_AVATAR_THEMED_BUTTON_AVATAR" file="win/avatar_button/themed/sign_in_button_avatar.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_THEMED_BUTTON_NORMAL_BOTTOM" file="win/avatar_button/themed/sign_in_button_bottom.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_THEMED_BUTTON_NORMAL_BOTTOM_LEFT" file="win/avatar_button/themed/sign_in_button_bottom_left.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_THEMED_BUTTON_NORMAL_BOTTOM_RIGHT" file="win/avatar_button/themed/sign_in_button_bottom_right.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_THEMED_BUTTON_NORMAL_CENTER" file="win/avatar_button/themed/sign_in_button_center.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_THEMED_BUTTON_NORMAL_LEFT" file="win/avatar_button/themed/sign_in_button_left.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_THEMED_BUTTON_NORMAL_RIGHT" file="win/avatar_button/themed/sign_in_button_right.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_THEMED_BUTTON_NORMAL_TOP" file="win/avatar_button/themed/sign_in_button_top.png" />
         <structure type="chrome_scaled_image" name="IDR_AVATAR_THEMED_BUTTON_NORMAL_TOP_LEFT" file="win/avatar_button/themed/sign_in_button_top_left.png" />
@@ skipping 182 matching lines @@
       </if>
       <if expr="_google_chrome">
         <structure type="chrome_scaled_image" name="IDR_WEBSTORE_ICON" file="google_chrome/webstore_icon.png" />
         <structure type="chrome_scaled_image" name="IDR_WEBSTORE_ICON_16" file="google_chrome/webstore_icon_16.png" />
         <structure type="chrome_scaled_image" name="IDR_WEBSTORE_ICON_24" file="google_chrome/webstore_icon_24.png" />
         <structure type="chrome_scaled_image" name="IDR_WEBSTORE_ICON_32" file="google_chrome/webstore_icon_32.png" />
       </if>
     </structures>
   </release>
 </grit>