Fix a crash when activating a select element inside a page action

chrome/browser/views/browser_bubble.h

Index: chrome/browser/views/browser_bubble.h
diff --git a/chrome/browser/views/browser_bubble.h b/chrome/browser/views/browser_bubble.h
index 74928f3e4e68078829375b270db860e3e7ce7212..eaf3d0b085e4f7796710194841acf6f7b323e9c0 100644
--- a/chrome/browser/views/browser_bubble.h
+++ b/chrome/browser/views/browser_bubble.h
@@ -19,11 +19,11 @@ class BrowserBubble {
   class Delegate {
    public:
     // Called when the Browser Window that this bubble is attached to moves.
-    virtual void BubbleBrowserWindowMoved(BrowserBubble* bubble) = 0;
+    virtual void BubbleBrowserWindowMoved(BrowserBubble* bubble) {}
 
     // Called with the Browser Window that this bubble is attached to is
     // about to close.
-    virtual void BubbleBrowserWindowClosing(BrowserBubble* bubble) = 0;
+    virtual void BubbleBrowserWindowClosing(BrowserBubble* bubble) {}
 
     // Called when the bubble became active / got focus.
     virtual void BubbleGotFocus(BrowserBubble* bubble) {}