Jumbo build fix: Use unique names of constants in message_center

A recent CL got rid of the shared constants and instead copied
them to relevant files. To work in jumbo builds they must then
have unique names.

(The alternative to find a shared location for the constants
seems not applicable in this case)

Bug: 783018,723882
Change-Id: I8e64dcf56bfe74d30279549291e89bdec80bc3d2
Reviewed-on: https://chromium-review.googlesource.com/905304
Commit-Queue: Daniel Bratell <bratell@opera.com>
Commit-Queue: Mostyn Bramley-Moore <mostynb@vewd.com>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534793}

ui/message_center/views/notification_view_md.cc

@@ -119,10 +119,10 @@ constexpr int kMessageViewWidth =
     kLeftContentPadding.right() - kContentRowPadding.left() -
     kContentRowPadding.right();
 
-const int kMinPixelsPerTitleCharacter = 4;
+const int kMinPixelsPerTitleCharacterMD = 4;
 
 // Character limit = pixels per line * line limit / min. pixels per character.
-constexpr size_t kMessageCharacterLimit =
+constexpr size_t kMessageCharacterLimitMD =
     kNotificationWidth * kMessageExpandedLineLimit / 3;
 
 // The default is 12, so this normally come out to 13.
@@ -854,7 +854,7 @@ void NotificationViewMD::CreateOrUpdateTitleView(
   }
 
   int title_character_limit =
-      kNotificationWidth * kMaxTitleLines / kMinPixelsPerTitleCharacter;
+      kNotificationWidth * kMaxTitleLines / kMinPixelsPerTitleCharacterMD;
 
   base::string16 title = gfx::TruncateString(
       notification.title(), title_character_limit, gfx::WORD_BREAK);
@@ -882,7 +882,7 @@ void NotificationViewMD::CreateOrUpdateMessageView(
   }
 
   base::string16 text = gfx::TruncateString(
-      notification.message(), kMessageCharacterLimit, gfx::WORD_BREAK);
+      notification.message(), kMessageCharacterLimitMD, gfx::WORD_BREAK);
 
   const gfx::FontList& font_list = GetTextFontList();