Handle mac trackpad zoom via GesturePinch events

chrome/browser/ui/cocoa/browser_window_controller.h

Index: chrome/browser/ui/cocoa/browser_window_controller.h
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.h b/chrome/browser/ui/cocoa/browser_window_controller.h
index aed9187114af3398b545c0d1509f98eb55608f84..f3eea0bd6246fee790b5e658c7a1a8f06c3add5e 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.h
+++ b/chrome/browser/ui/cocoa/browser_window_controller.h
@@ -108,11 +108,6 @@ class Command;
   // NO on growth.
   BOOL isShrinkingFromZoomed_;
 
-  // The raw accumulated zoom value and the actual zoom increments made for an
-  // an in-progress pinch gesture.
-  CGFloat totalMagnifyGestureAmount_;
-  NSInteger currentZoomStepDelta_;
-
   // The view controller that manages the incognito badge or the multi-profile
   // avatar button. Depending on whether the --new-profile-management flag is
   // used, the multi-profile button can either be the avatar's icon badge or a