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

chrome/browser/ui/webui/constrained_web_dialog_ui.h

Index: chrome/browser/ui/webui/constrained_web_dialog_ui.h
===================================================================
--- chrome/browser/ui/webui/constrained_web_dialog_ui.h	(revision 135175)
+++ chrome/browser/ui/webui/constrained_web_dialog_ui.h	(working copy)
@@ -12,8 +12,11 @@
 class ConstrainedWindow;
 class Profile;
 class TabContentsWrapper;
+
+namespace web_dialogs {
 class WebDialogDelegate;
-class WebDialogWebContentsDelegate;
+}
+class ChromeWebDialogWebContentsDelegate;
 
 namespace base {
 template<class T> class PropertyAccessor;
@@ -25,8 +28,9 @@
 
 class ConstrainedWebDialogDelegate {
  public:
-  virtual const WebDialogDelegate* GetWebDialogDelegate() const = 0;
-  virtual WebDialogDelegate* GetWebDialogDelegate() = 0;
+  virtual const web_dialogs::WebDialogDelegate*
+    GetWebDialogDelegate() const = 0;
+  virtual web_dialogs::WebDialogDelegate* GetWebDialogDelegate() = 0;
 
   // Called when the dialog is being closed in response to a "DialogClose"
   // message from WebUI.
@@ -76,8 +80,8 @@
   // |overshadowed| is the tab being overshadowed by the dialog.
   static ConstrainedWebDialogDelegate* CreateConstrainedWebDialog(
       Profile* profile,
-      WebDialogDelegate* delegate,
-      WebDialogWebContentsDelegate* tab_delegate,
+      web_dialogs::WebDialogDelegate* delegate,
+      ChromeWebDialogWebContentsDelegate* tab_delegate,
       TabContentsWrapper* overshadowed);
 
   // Returns a property accessor that can be used to set the