[Extensions] Make extension message bubble factory platform-abstract

chrome/browser/extensions/dev_mode_bubble_controller.cc

Index: chrome/browser/extensions/dev_mode_bubble_controller.cc
diff --git a/chrome/browser/extensions/dev_mode_bubble_controller.cc b/chrome/browser/extensions/dev_mode_bubble_controller.cc
index 202207ca5783c6f5f20d920d10e5b9cbe689aa2c..d6914e503a83524f100fc598604e207161009ae6 100644
--- a/chrome/browser/extensions/dev_mode_bubble_controller.cc
+++ b/chrome/browser/extensions/dev_mode_bubble_controller.cc
@@ -52,6 +52,7 @@ class DevModeBubbleDelegate
   base::string16 GetActionButtonLabel() const override;
   base::string16 GetDismissButtonLabel() const override;
   bool ShouldShowExtensionList() const override;
+  bool ShouldHighlightExtensions() const override;
   void LogExtensionCount(size_t count) override;
   void LogAction(
       ExtensionMessageBubbleController::BubbleAction action) override;
@@ -127,6 +128,10 @@ bool DevModeBubbleDelegate::ShouldShowExtensionList() const {
   return false;
 }
 
+bool DevModeBubbleDelegate::ShouldHighlightExtensions() const {
+  return true;
+}
+
 void DevModeBubbleDelegate::LogExtensionCount(size_t count) {
   UMA_HISTOGRAM_COUNTS_100(
       "ExtensionBubble.ExtensionsInDevModeCount", count);