Update notification style: allow 2-line titles if the message is blank.

ui/message_center/views/constants.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_MESSAGE_CENTER_VIEWS_CONSTANTS_H_
 #define UI_MESSAGE_CENTER_VIEWS_CONSTANTS_H_
 
 #include "base/basictypes.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/size.h"
@@ skipping 13 matching lines @@
 const int kTextLeftPadding = kIconSize + message_center::kIconToTextPadding;
 const int kTextBottomPadding = 12;
 const int kTextRightPadding = 23;
 const int kItemTitleToMessagePadding = 3;
 const int kButtonVecticalPadding = 0;
 const int kButtonTitleTopPadding = 0;
 
 // Character limits: Displayed text will be subject to the line limits above,
 // but we also remove trailing characters from text to reduce processing cost.
 // Character limit = pixels per line * line limit / min. pixels per character.
-const size_t kTitleCharacterLimit =
-    message_center::kNotificationWidth * message_center::kTitleLineLimit / 4;
+const int kMinPixelsPerTitleCharacter = 4;
 const size_t kMessageCharacterLimit =
     message_center::kNotificationWidth *
         message_center::kMessageExpandedLineLimit / 3;
 const size_t kContextMessageCharacterLimit =
     message_center::kNotificationWidth *
     message_center::kContextMessageLineLimit / 3;
 
 }  // namespace message_center
 
 #endif // UI_MESSAGE_CENTER_VIEWS_CONSTANTS_H_