Clear app banner data when history is cleared.

chrome/browser/banners/app_banner_settings_helper.h

Index: chrome/browser/banners/app_banner_settings_helper.h
diff --git a/chrome/browser/banners/app_banner_settings_helper.h b/chrome/browser/banners/app_banner_settings_helper.h
index ee6a7c4fc978543ee0dfedee3d84fab5cc784e92..10b86fb7d1616c96b574e6bfda256037265cf096 100644
--- a/chrome/browser/banners/app_banner_settings_helper.h
+++ b/chrome/browser/banners/app_banner_settings_helper.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_
 #define CHROME_BROWSER_BANNERS_APP_BANNER_SETTINGS_HELPER_H_
 
+#include <set>
 #include <string>
 #include <vector>
 
@@ -16,6 +17,7 @@ class WebContents;
 }  // namespace content
 
 class GURL;
+class Profile;
 
 // Utility class to record banner events for the given package or start url.
 //
@@ -44,6 +46,13 @@ class AppBannerSettingsHelper {
     APP_BANNER_EVENT_NUM_EVENTS,
   };
 
+  // The content setting basically records a simplified subset of history.
+  // For privacy reasons this needs to be cleared. The ClearHistoryForURLs
+  // function removes any information from the banner content settings for the
+  // given URls.
+  static void ClearHistoryForURLs(Profile* profile,
+                                  const std::set<GURL>& origin_urls);
+
   static void RecordBannerEvent(content::WebContents* web_contents,
                                 const GURL& origin_url,
                                 const std::string& package_name_or_start_url,