Implement new-style image notification resizing.

ui/message_center/views/notification_view_md.h

Index: ui/message_center/views/notification_view_md.h
diff --git a/ui/message_center/views/notification_view_md.h b/ui/message_center/views/notification_view_md.h
index 35fdbbab839a45b4392dc4993021203c031e75a8..3df4d1a206c462740bd6e0a9a16dca770ba03a77 100644
--- a/ui/message_center/views/notification_view_md.h
+++ b/ui/message_center/views/notification_view_md.h
@@ -29,6 +29,7 @@ class ProportionalImageView;
 namespace {
 class CompactTitleMessageView;
 class ItemView;
+class LargeImageView;
 }
 
 // View that displays all current types of notification (web, basic, image, and
@@ -102,8 +103,7 @@ class MESSAGE_CENTER_EXPORT NotificationViewMD
   views::Label* title_view_ = nullptr;
   BoundedLabel* message_view_ = nullptr;
   ProportionalImageView* icon_view_ = nullptr;
-  views::View* image_container_ = nullptr;
-  ProportionalImageView* image_view_ = nullptr;
+  LargeImageView* image_view_ = nullptr;
   std::vector<views::LabelButton*> action_buttons_;
   std::vector<ItemView*> item_views_;
   views::ProgressBar* progress_bar_view_ = nullptr;