Moves overscroll code out of the ios_internal namespace.

ios/chrome/browser/ui/fullscreen_controller.mm

Index: ios/chrome/browser/ui/fullscreen_controller.mm
diff --git a/ios/chrome/browser/ui/fullscreen_controller.mm b/ios/chrome/browser/ui/fullscreen_controller.mm
index 441680faeb115473799d10766e2eb8b94987d3d2..f964931605757e58fe6a174eb030f35243f137b4 100644
--- a/ios/chrome/browser/ui/fullscreen_controller.mm
+++ b/ios/chrome/browser/ui/fullscreen_controller.mm
@@ -298,11 +298,11 @@ BOOL CGFloatEquals(CGFloat a, CGFloat b) {
     // crbug/451373.
     [center addObserver:self
                selector:@selector(overscrollActionsWillStart)
-                   name:ios_internal::kOverscollActionsWillStart
+                   name:kOverscrollActionsWillStart
                  object:nil];
     [center addObserver:self
                selector:@selector(overscrollActionsDidEnd)
-                   name:ios_internal::kOverscollActionsDidEnd
+                   name:kOverscrollActionsDidEnd
                  object:nil];
     [self moveHeaderToRestingPosition:YES];
   }