Move code that doesn't depend on PPAPI out of remoting/client/plugin

remoting/client/plugin/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("//remoting/remoting_srcs.gni")
 
 source_set("plugin") {
   sources =
       rebase_path(remoting_srcs_gypi_values.remoting_client_plugin_sources,
                   ".",
                   "//remoting")
 
-  if (!is_chromeos) {
-    sources -= [
-      "normalizing_input_filter_cros.cc",
-      "normalizing_input_filter_cros.h",
-    ]
-  }
-
   # TODO(GYP) when a nacl version of this target is made, these files
   # won't be part of it.
   sources += [
     "pepper_entrypoints.cc",
     "pepper_entrypoints.h",
   ]
 
   configs += [ "//build/config/compiler:wexit_time_destructors" ]
 
   defines = [ "HAVE_STDINT_H" ]  # Required by on2_integer.h.
 
   deps = [
     "//net",
     "//ppapi/cpp:objects",
     "//ppapi/cpp/private:internal_module",
     "//remoting/base",
     "//remoting/client",
     "//remoting/codec",
     "//remoting/protocol",
     "//third_party/webrtc/modules/desktop_capture",
     "//ui/events:dom_keycode_converter",
   ]
 }
-
-source_set("unit_tests") {
-  testonly = true
-
-  sources = [
-    "empty_cursor_filter_unittest.cc",
-    "normalizing_input_filter_mac_unittest.cc",
-    "touch_input_scaler_unittest.cc",
-  ]
-
-  if (is_chromeos) {
-    sources += [ "normalizing_input_filter_cros_unittest.cc" ]
-  }
-
-  deps = [
-    ":plugin",
-    "//remoting/proto",
-    "//testing/gmock",
-    "//testing/gtest",
-    "//third_party/webrtc",
-  ]
-}