Remove unnecessary explicit keyword in ExclusiveAccessBubble class

chrome/browser/ui/exclusive_access/exclusive_access_bubble.h

Index: chrome/browser/ui/exclusive_access/exclusive_access_bubble.h
diff --git a/chrome/browser/ui/exclusive_access/exclusive_access_bubble.h b/chrome/browser/ui/exclusive_access/exclusive_access_bubble.h
index be715c50a8fabc6c0bd5b8a0b9c13eda1d7c0818..0e6bd8e4b11261c0cf4bb02a6e45235ddb0f6ce2 100644
--- a/chrome/browser/ui/exclusive_access/exclusive_access_bubble.h
+++ b/chrome/browser/ui/exclusive_access/exclusive_access_bubble.h
@@ -30,9 +30,9 @@ class Rect;
 //   has elapsed, the next user input re-displays the bubble.
 class ExclusiveAccessBubble : public gfx::AnimationDelegate {
  public:
-  explicit ExclusiveAccessBubble(ExclusiveAccessManager* manager,
-                                 const GURL& url,
-                                 ExclusiveAccessBubbleType bubble_type);
+  ExclusiveAccessBubble(ExclusiveAccessManager* manager,
+                        const GURL& url,
+                        ExclusiveAccessBubbleType bubble_type);
   ~ExclusiveAccessBubble() override;
 
   // Informs the ExclusiveAccessBubble of some user input, which may update