Eliminate pinch drift by removing touch radius from span calculation

ui/events/gesture_detection/gesture_provider_config_helper.cc

 // Copyright 2014 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 "ui/events/gesture_detection/gesture_provider_config_helper.h"
 
 #include "ui/events/gesture_detection/gesture_configuration.h"
 #include "ui/gfx/screen.h"
 
 namespace ui {
@@ skipping 32 matching lines @@
       gesture_config.max_touch_down_duration_for_click_in_ms());
   config.single_tap_repeat_interval = gesture_config.max_tap_count();
   config.velocity_tracker_strategy = gesture_config.velocity_tracker_strategy();
   return config;
 }
 
 ScaleGestureDetector::Config BuildScaleGestureDetectorConfig(
     const GestureConfiguration& gesture_config) {
   ScaleGestureDetector::Config config;
   config.span_slop = gesture_config.span_slop();
-  config.min_scaling_touch_major = gesture_config.min_scaling_touch_major();
   config.min_scaling_span = gesture_config.min_scaling_span_in_pixels();
   config.min_pinch_update_span_delta =
       gesture_config.min_pinch_update_span_delta();
   config.stylus_scale_enabled = gesture_config.stylus_scale_enabled();
   return config;
 }
 
 GestureProvider::Config BuildGestureProviderConfig(
     const GestureConfiguration& gesture_config) {
   GestureProvider::Config config;
@@ skipping 28 matching lines @@
 
   gfx::Screen* screen = gfx::Screen::GetScreen();
   // |screen| is sometimes NULL during tests.
   if (screen)
     config.display = screen->GetPrimaryDisplay();
 
   return config;
 }
 
 }  // namespace ui