Upstream chromium side of modal dialogs for webview.

chrome/browser/android/chrome_web_contents_delegate_android.cc

Index: chrome/browser/android/chrome_web_contents_delegate_android.cc
diff --git a/chrome/browser/android/chrome_web_contents_delegate_android.cc b/chrome/browser/android/chrome_web_contents_delegate_android.cc
index 84d2685c1b1cd4fecc6e82b31a0a3d6f8e25b30e..08c5cc97d7addda550c2191ad7285db76603c659 100644
--- a/chrome/browser/android/chrome_web_contents_delegate_android.cc
+++ b/chrome/browser/android/chrome_web_contents_delegate_android.cc
@@ -10,6 +10,7 @@
 #include "chrome/browser/ui/find_bar/find_notification_details.h"
 #include "chrome/browser/ui/find_bar/find_tab_helper.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
+#include "chrome/browser/ui/app_modal_dialogs/javascript_dialog_creator.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_service.h"
@@ -229,5 +230,10 @@ void ChromeWebContentsDelegateAndroid::FindMatchRectsReply(
       details_object.obj());
 }
 
+content::JavaScriptDialogCreator*
+ChromeWebContentsDelegateAndroid::GetJavaScriptDialogCreator() {
+  return GetJavaScriptDialogCreatorInstance();
+}
+
 }  // namespace android
 }  // namespace chrome