Revert of Mac: Enable two finger double-tap smart zoom

content/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 
@@ skipping 2253 matching lines @@
 }
 
 - (void)touchesCancelledWithEvent:(NSEvent*)event {
   [responderDelegate_ touchesCancelledWithEvent:event];
 }
 
 - (void)touchesEndedWithEvent:(NSEvent*)event {
   [responderDelegate_ touchesEndedWithEvent:event];
 }
 
-- (void)smartMagnifyWithEvent:(NSEvent*)event {
-  const WebGestureEvent& smartMagnifyEvent =
-      WebInputEventFactory::gestureEvent(event, self);
-  renderWidgetHostView_->render_widget_host_->ForwardGestureEvent(
-      smartMagnifyEvent);
-}
-
 // This is invoked only on 10.8 or newer when the user taps a word using
 // three fingers.
 - (void)quickLookWithEvent:(NSEvent*)event {
   NSPoint point = [self convertPoint:[event locationInWindow] fromView:nil];
   TextInputClientMac::GetInstance()->GetStringAtPoint(
       renderWidgetHostView_->render_widget_host_,
       gfx::Point(point.x, NSHeight([self frame]) - point.y),
       ^(NSAttributedString* string, NSPoint baselinePoint) {
           if (string && [string length] > 0) {
             dispatch_async(dispatch_get_main_queue(), ^{
@@ skipping 1125 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end