Chrome Cleaner UI: Add a dialog class for the new UI

chrome/browser/safe_browsing/srt_prompt_controller.h

Index: chrome/browser/safe_browsing/srt_prompt_controller.h
diff --git a/chrome/browser/safe_browsing/srt_prompt_controller.h b/chrome/browser/safe_browsing/srt_prompt_controller.h
index 3546491c10c19d6a22ba0dce93d9ef74bc432acf..3245f19ec9bf35caf1399563ae884755507821b1 100644
--- a/chrome/browser/safe_browsing/srt_prompt_controller.h
+++ b/chrome/browser/safe_browsing/srt_prompt_controller.h
@@ -10,6 +10,8 @@
 #include "base/macros.h"
 #include "base/strings/string16.h"
 
+class Browser;
+
 namespace safe_browsing {
 
 // Provides the various elements that will be displayed in the Chrome Cleaner
@@ -43,6 +45,8 @@ class SRTPromptController {
 
   SRTPromptController();
 
+  static void ShowSRTPrompt(Browser* browser, SRTPromptController* controller);
+
   base::string16 GetWindowTitle() const;
   // The text to be shown in the Cleaner dialog's main section and will
   // always be visible while the dialog is displayed.