Extract a minimal subset of WebDialogUI/WebDialogDelegate from src/chrome -> src/ui/web_dialogs

chrome/browser/ui/browser_dialogs.h

Index: chrome/browser/ui/browser_dialogs.h
===================================================================
--- chrome/browser/ui/browser_dialogs.h	(revision 135175)
+++ chrome/browser/ui/browser_dialogs.h	(working copy)
@@ -16,12 +16,15 @@
 class TabContentsWrapper;
 class TabModalConfirmDialogDelegate;
 class TemplateURL;
-class WebDialogDelegate;
 
 namespace content {
 class WebContents;
 }
 
+namespace web_dialogs {
+class WebDialogDelegate;
+}
+
 namespace browser {
 
 #if defined(IPC_MESSAGE_LOG_ENABLED)
@@ -44,7 +47,7 @@
 gfx::NativeWindow ShowWebDialog(gfx::NativeWindow parent,
                                 Profile* profile,
                                 Browser* browser,
-                                WebDialogDelegate* delegate);
+                                web_dialogs::WebDialogDelegate* delegate);
 
 // Shows the collected cookies dialog box.
 void ShowCollectedCookiesDialog(gfx::NativeWindow parent_window,