[Mac] Refactor the fullscreen toolbar mouse tracker

chrome/browser/ui/cocoa/browser_window_controller_private.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_private.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_private.mm b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
index 7d872ec21c640cc876f5ad25861fe7945860a7c6..c9c6224ab6b621c1d9d08f38a3fecbddadda4a81 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
@@ -453,12 +453,6 @@ willPositionSheet:(NSWindow*)sheet
     manager->UpdateAnchorPosition();
 }
 
-- (void)configureFullscreenToolbarController {
-  NSView* contentView = [[self window] contentView];
-  [fullscreenToolbarController_
-      setupFullscreenToolbarForContentView:contentView];
-}
-
 - (void)adjustUIForExitingFullscreenAndStopOmniboxSliding {
   [fullscreenToolbarController_ exitFullscreenMode];
   fullscreenToolbarController_.reset();
@@ -476,7 +470,7 @@ willPositionSheet:(NSWindow*)sheet
   if (!fullscreenToolbarController_) {
     fullscreenToolbarController_.reset(
         [self newFullscreenToolbarControllerWithStyle:style]);
-    [self configureFullscreenToolbarController];
+    [fullscreenToolbarController_ enterFullscreenMode];
   } else {
     fullscreenToolbarController_.get().slidingStyle = style;
   }
@@ -999,7 +993,7 @@ willPositionSheet:(NSWindow*)sheet
   if (!NSIsEmptyRect(output.fullscreenBackingBarFrame)) {
     [floatingBarBackingView_ setFrame:output.fullscreenBackingBarFrame];
     [fullscreenToolbarController_
-        setTrackingAreaFromOverlayFrame:output.fullscreenBackingBarFrame];
+        updateToolbarFrame:output.fullscreenBackingBarFrame];
   }
 
   [findBarCocoaController_