Remove JS dialog dependency from content.

chrome/browser/sidebar/sidebar_container.cc

Index: chrome/browser/sidebar/sidebar_container.cc
diff --git a/chrome/browser/sidebar/sidebar_container.cc b/chrome/browser/sidebar/sidebar_container.cc
index d1e4a332b7a8d3c92c72392a11fe8a1e1624805b..4013537409aa23dd922e0fe1750e631cf3a0ac6c 100644
--- a/chrome/browser/sidebar/sidebar_container.cc
+++ b/chrome/browser/sidebar/sidebar_container.cc
@@ -6,6 +6,7 @@
 
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/app_modal_dialogs/message_box_handler.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_resource.h"
 #include "chrome/common/extensions/extension_sidebar_defaults.h"
@@ -108,6 +109,11 @@ bool SidebarContainer::IsPopup(const TabContents* source) const {
   return false;
 }
 
+content::JavaScriptDialogCreator*
+SidebarContainer::GetJavaScriptDialogCreator() {
+  return GetJavaScriptDialogCreatorInstance();
+}
+
 void SidebarContainer::OnImageLoaded(SkBitmap* image,
                                      const ExtensionResource& resource,
                                      int index) {