[Resources] Add profile-sized assets for the generic placeholder.

chrome/browser/profiles/profile_info_cache.cc

Index: chrome/browser/profiles/profile_info_cache.cc
diff --git a/chrome/browser/profiles/profile_info_cache.cc b/chrome/browser/profiles/profile_info_cache.cc
index 4e6803e2ceb57727fbdd9386df1918ab01c384ac..e5736679d36d3a6c5f09915e730f4817b27389b0 100644
--- a/chrome/browser/profiles/profile_info_cache.cc
+++ b/chrome/browser/profiles/profile_info_cache.cc
@@ -1006,8 +1006,12 @@ const gfx::Image* ProfileInfoCache::GetHighResAvatarOfProfileAtIndex(
   int avatar_index = GetAvatarIconIndexOfProfileAtIndex(index);
   std::string key = profiles::GetDefaultAvatarIconFileNameAtIndex(avatar_index);
 
-  if (!strcmp(key.c_str(), profiles::GetNoHighResAvatarFileName()))
-      return NULL;
+  // If this is the placeholder avatar, it is already included in the
+  // resources, so it doesn't need to be downloaded.
+  if (!strcmp(key.c_str(), profiles::GetNoHighResAvatarFileName())) {
+    return &ui::ResourceBundle::GetSharedInstance().GetImageNamed(
+        profiles::GetPlaceholderAvatarIconResourceID());
+  }
 
   base::FilePath image_path =
       profiles::GetPathOfHighResAvatarAtIndex(avatar_index);