Remove NOTIFICATION_BROWSER_FLING_CURVE_PARAMETERS_CHANGED.

It hasn't been broadcast as a notification since r369162,
more than two years ago. The code that listens for it is dead.

BUG=268984

Change-Id: Ia8ed45dcf334c5eb96a8ea4c1fe6706f82b299b3
Reviewed-on: https://chromium-review.googlesource.com/974324Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544958}

chrome/browser/chrome_notification_types.h

@@ -75,12 +75,6 @@ enum NotificationType {
   // Source<ThemeService>. There are no details.
   NOTIFICATION_BROWSER_THEME_CHANGED,
 
-#if defined(USE_AURA)
-  // The user has changed the fling curve configuration.
-  // Source<GesturePrefsObserver>. There are no details.
-  NOTIFICATION_BROWSER_FLING_CURVE_PARAMETERS_CHANGED,
-#endif  // defined(USE_AURA)
-
   // Sent when the renderer returns focus to the browser, as part of focus
   // traversal. The source is the browser, there are no details.
   NOTIFICATION_FOCUS_RETURNED_TO_BROWSER,

chrome/browser/ui/prefs/prefs_tab_helper.cc

@@ -465,11 +465,6 @@ PrefsTabHelper::PrefsTabHelper(WebContents* contents)
                  content::Source<ThemeService>(
                      ThemeServiceFactory::GetForProfile(profile_)));
 #endif
-#if defined(USE_AURA)
-  registrar_.Add(this,
-                 chrome::NOTIFICATION_BROWSER_FLING_CURVE_PARAMETERS_CHANGED,
-                 content::NotificationService::AllSources());
-#endif
 }
 
 PrefsTabHelper::~PrefsTabHelper() {
@@ -579,13 +574,6 @@ void PrefsTabHelper::Observe(int type,
   }
 #endif
 
-#if defined(USE_AURA)
-  if (type == chrome::NOTIFICATION_BROWSER_FLING_CURVE_PARAMETERS_CHANGED) {
-    UpdateRendererPreferences();
-    return;
-  }
-#endif  // defined(USE_AURA)
-
   NOTREACHED();
 }