Remove MTP support on Linux.

components/storage_monitor/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/features.gni")
 
-# GYP version: components/storage_monitor.gypi:storage_monitor
 static_library("storage_monitor") {
   sources = [
     "image_capture_device.h",
     "image_capture_device.mm",
     "image_capture_device_manager.h",
     "image_capture_device_manager.mm",
     "media_storage_util.cc",
     "media_storage_util.h",
-    "media_transfer_protocol_device_observer_linux.cc",
-    "media_transfer_protocol_device_observer_linux.h",
     "mtab_watcher_linux.cc",
     "mtab_watcher_linux.h",
     "portable_device_watcher_win.cc",
     "portable_device_watcher_win.h",
     "removable_device_constants.cc",
     "removable_device_constants.h",
     "removable_storage_observer.h",
     "storage_info.cc",
     "storage_info.h",
     "storage_monitor.cc",
@@ skipping 21 matching lines @@
   ]
 
   if (is_mac) {
     libs = [
       "DiskArbitration.framework",
       "Foundation.framework",
       "ImageCaptureCore.framework",
     ]
   }
 
-  if (is_linux && use_dbus) {
+  if (is_chromeos && use_dbus) {
     deps += [
       "//device/media_transfer_protocol",
       "//device/media_transfer_protocol:mtp_file_entry_proto",
       "//device/media_transfer_protocol:mtp_storage_info_proto",
     ]
+    sources += [
+      "media_transfer_protocol_device_observer_chromeos.cc",
+      "media_transfer_protocol_device_observer_chromeos.h",
+    ]
   }
 
   if (use_udev) {
     deps += [ "//device/udev_linux" ]
   } else if (is_linux) {
     # These were already removed for non-Linux.
     sources -= [
       "storage_monitor_linux.cc",
       "storage_monitor_linux.h",
       "udev_util_linux.cc",
       "udev_util_linux.h",
     ]
   }
 
   if (is_chromeos) {
     sources -= [
       "mtab_watcher_linux.cc",
       "mtab_watcher_linux.h",
       "storage_monitor_linux.cc",
       "storage_monitor_linux.h",
     ]
     deps += [ "//chromeos" ]
   }
 }
 
-# GYP version: components/storage_monitor.gypi:storage_monitor_test_support
 static_library("test_support") {
   testonly = true
   sources = [
     "mock_removable_storage_observer.cc",
     "mock_removable_storage_observer.h",
-    "test_media_transfer_protocol_manager_linux.cc",
-    "test_media_transfer_protocol_manager_linux.h",
+    "test_media_transfer_protocol_manager_chromeos.cc",
+    "test_media_transfer_protocol_manager_chromeos.h",
     "test_portable_device_watcher_win.cc",
     "test_portable_device_watcher_win.h",
     "test_storage_monitor.cc",
     "test_storage_monitor.h",
     "test_storage_monitor_win.cc",
     "test_storage_monitor_win.h",
     "test_volume_mount_watcher_win.cc",
     "test_volume_mount_watcher_win.h",
   ]
 
   public_deps = [
     ":storage_monitor",
     "//base",
     "//content/public/browser",
   ]
 
-  if (is_linux && use_dbus) {
+  if (is_chromeos && use_dbus) {
     deps = [
       "//device/media_transfer_protocol",
       "//device/media_transfer_protocol:mtp_file_entry_proto",
       "//device/media_transfer_protocol:mtp_storage_info_proto",
     ]
   }
 
   if (is_win) {
     deps = [
       "//testing/gtest",
     ]
   }
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "image_capture_device_manager_unittest.mm",
     "media_storage_util_unittest.cc",
-    "media_transfer_protocol_device_observer_linux_unittest.cc",
+    "media_transfer_protocol_device_observer_chromeos_unittest.cc",
     "storage_info_unittest.cc",
     "storage_monitor_mac_unittest.mm",
     "storage_monitor_unittest.cc",
     "storage_monitor_win_unittest.cc",
   ]
 
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   deps = [
     ":test_support",
     "//content/test:test_support",
     "//testing/gtest",
   ]
 
-  if (is_linux && use_dbus) {
-    deps += [ "//device/media_transfer_protocol" ]
-    if (!is_chromeos) {
+  if (use_dbus) {
+    if (is_chromeos) {
+      deps += [
+        "//device/media_transfer_protocol",
+        "//device/media_transfer_protocol:mtp_file_entry_proto",
+        "//device/media_transfer_protocol:mtp_storage_info_proto",
+        "//testing/gmock",
+      ]
+      sources += [ "storage_monitor_chromeos_unittest.cc" ]
+    } else if (is_linux) {
       sources += [ "storage_monitor_linux_unittest.cc" ]
     }
   }
   if (is_chromeos) {
-    sources += [ "storage_monitor_chromeos_unittest.cc" ]
-    deps += [
-      "//chromeos:test_support",
-      "//testing/gmock",
-    ]
+    deps += [ "//chromeos:test_support" ]
   }
 }