Suppress JavaScript dialogs when a tab puts itself into fullscreen.

content/public/browser/web_contents_delegate.cc

Index: content/public/browser/web_contents_delegate.cc
diff --git a/content/public/browser/web_contents_delegate.cc b/content/public/browser/web_contents_delegate.cc
index df973484d0d98a93526ab6b06869e9c4a28a570b..7f8b375794ea0bcce8a68bd635d20b9d00066e85 100644
--- a/content/public/browser/web_contents_delegate.cc
+++ b/content/public/browser/web_contents_delegate.cc
@@ -40,7 +40,8 @@ gfx::Rect WebContentsDelegate::GetRootWindowResizerRect() const {
   return gfx::Rect();
 }
 
-bool WebContentsDelegate::ShouldSuppressDialogs(WebContents* source) {
+bool WebContentsDelegate::ShouldSuppressDialogs(WebContents* source,
+                                                bool before_unload) {
   return false;
 }