ArcVolumeMounter : use localized "My files" string

Bug: b:123362537
Test: check that translated string is shown in Android file picker
Change-Id: I0075fe0ccf6121401170ebafa88a754c8e242689
Reviewed-on: https://chromium-review.googlesource.com/c/1490368Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Satoshi Niwa <niwa@chromium.org>
Auto-Submit: Satoshi Niwa <niwa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636243}

components/arc/BUILD.gn

@@ -113,6 +113,7 @@ static_library("arc") {
     "//ui/base:base",
     "//ui/base/clipboard",
     "//ui/base/ime",
+    "//ui/chromeos/strings",
     "//ui/display/manager",
     "//ui/events",
     "//ui/events:dom_keycode_converter",

components/arc/volume_mounter/DEPS

 include_rules = [
     "+chromeos/disks",
     "+third_party/re2",
+    "+ui/base/l10n",
+    "+ui/chromeos/strings",
 ]

components/arc/volume_mounter/arc_volume_mounter_bridge.cc

@@ -14,6 +14,8 @@
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/arc_browser_context_keyed_service_factory_base.h"
 #include "third_party/re2/src/re2/re2.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/chromeos/strings/grit/ui_chromeos_strings.h"
 
 using chromeos::disks::DiskMountManager;
 
@@ -23,9 +25,9 @@ namespace {
 
 // TODO(crbug.com/929031): Move MyFiles constants to a common place.
 constexpr char kMyFilesPath[] = "/home/chronos/user/MyFiles";
-constexpr char kMyFilesVolumeName[] = "My files";
 // Dummy UUID for MyFiles volume.
 constexpr char kMyFilesUuid[] = "0000000000000000000000000000CAFEF00D2019";
+// Dummy UUID for testing.
 constexpr char kDummyUuid[] = "00000000000000000000000000000000DEADBEEF";
 
 // Singleton factory for ArcVolumeMounterBridge.
@@ -90,8 +92,8 @@ void ArcVolumeMounterBridge::SendMountEventForMyFiles() {
   if (!volume_mounter_instance)
     return;
 
-  // TODO(niwa): Send localized string for "My files".
-  std::string device_label = kMyFilesVolumeName;
+  std::string device_label =
+      l10n_util::GetStringUTF8(IDS_FILE_BROWSER_MY_FILES_ROOT_LABEL);
 
   // TODO(niwa): Add a new DeviceType enum value for MyFiles.
   chromeos::DeviceType device_type = chromeos::DeviceType::DEVICE_TYPE_SD;