Eliminate pinch drift by removing touch radius from span calculation

ui/mojo/init/ui_init.cc

 // Copyright 2015 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/mojo/init/ui_init.h"
 
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "build/build_config.h"
 #include "ui/mojo/init/screen_mojo.h"
 
 #if defined(OS_ANDROID)
 #include "ui/events/gesture_detection/gesture_configuration.h"  // nogncheck
 #endif
 
 namespace ui {
 namespace mojo {
 
 #if defined(OS_ANDROID)
 // TODO(sky): this needs to come from system.
 class GestureConfigurationMojo : public ui::GestureConfiguration {
  public:
   GestureConfigurationMojo() : GestureConfiguration() {
     set_double_tap_enabled(false);
     set_double_tap_timeout_in_ms(semi_long_press_time_in_ms());
     set_gesture_begin_end_types_enabled(true);
     set_min_gesture_bounds_length(default_radius());
     set_min_pinch_update_span_delta(0);
-    set_min_scaling_touch_major(default_radius() * 2);
     set_velocity_tracker_strategy(
         ui::VelocityTracker::Strategy::LSQ2_RESTRICTED);
     set_span_slop(max_touch_move_in_pixels_for_click() * 2);
     set_swipe_enabled(true);
     set_two_finger_tap_enabled(true);
   }
 
   ~GestureConfigurationMojo() override {}
 
  private:
@@ skipping 12 matching lines @@
 
 UIInit::~UIInit() {
   gfx::Screen::SetScreenInstance(nullptr);
 #if defined(OS_ANDROID)
   ui::GestureConfiguration::SetInstance(nullptr);
 #endif
 }
 
 }  // namespace mojo
 }  // namespace ui