Remove user gesture tracking

sky/engine/platform/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//sky/engine/build/scripts/scripts.gni")
 import("//sky/engine/config.gni")
 import("//testing/test.gni")
 
 # Most targets in this file are private actions so use that as the default.
@@ skipping 570 matching lines @@
     "transforms/ScaleTransformOperation.h",
     "transforms/SkewTransformOperation.cpp",
     "transforms/SkewTransformOperation.h",
     "transforms/TransformationMatrix.cpp",
     "transforms/TransformationMatrix.h",
     "transforms/TransformOperation.h",
     "transforms/TransformOperations.cpp",
     "transforms/TransformOperations.h",
     "transforms/TranslateTransformOperation.cpp",
     "transforms/TranslateTransformOperation.h",
-    "UserGestureIndicator.cpp",
-    "UserGestureIndicator.h",
     "weborigin/KnownPorts.cpp",
     "weborigin/KnownPorts.h",
     "weborigin/KURL.cpp",
     "weborigin/KURL.h",
     "weborigin/KURLHash.h",
     "weborigin/Referrer.h",
     "weborigin/ReferrerPolicy.h",
     "weborigin/SecurityPolicy.cpp",
     "weborigin/SecurityPolicy.h",
     "WebThread.cpp",
@@ skipping 162 matching lines @@
     # See https://bugs.webkit.org/show_bug.cgi?id=62916.
     # TODO(GYP)
     #'cflags': ['-marm'],
     #    'conditions': [
     #      ['OS=="android"', {
     #        'cflags!': ['-mthumb'],
     #      }],
     #    ],
   }
 }