Remove many unused files from //skia/ext

ui/gfx/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("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 # Several targets want to include this header file, and some of them are
 # child dependencies of "gfx". Therefore, we separate it out here so multiple
 # targets can all have a dependency for header checking purposes without
 # creating circular dependencies.
 source_set("gfx_export") {
   sources = [
     "gfx_export.h",
   ]
 }
 
 component("gfx") {
   sources = [
     "android/device_display_info.cc",
     "android/device_display_info.h",
     "android/gfx_jni_registrar.cc",
     "android/gfx_jni_registrar.h",
-    "android/java_bitmap.cc",
-    "android/java_bitmap.h",
     "android/shared_device_display_info.cc",
     "android/shared_device_display_info.h",
     "android/view_configuration.cc",
     "android/view_configuration.h",
     "animation/animation.cc",
     "animation/animation.h",
     "animation/animation_container.cc",
     "animation/animation_container.h",
     "animation/animation_container_element.h",
     "animation/animation_container_observer.h",
@@ skipping 181 matching lines @@
 if (is_android) {
   generate_jni("gfx_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/gfx/BitmapHelper.java",
       "../android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java",
       "../android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     ]
     jni_package = "gfx"
   }
 }