Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/storage_monitor/storage_monitor_chromeos.cc

Index: chrome/browser/storage_monitor/storage_monitor_chromeos.cc
diff --git a/chrome/browser/storage_monitor/storage_monitor_chromeos.cc b/chrome/browser/storage_monitor/storage_monitor_chromeos.cc
index c14e44cb928d1177dc6f8d2eb9be69d6371d7aad..6b090c39f976c03a2f5a02163a480acc7ec2b690 100644
--- a/chrome/browser/storage_monitor/storage_monitor_chromeos.cc
+++ b/chrome/browser/storage_monitor/storage_monitor_chromeos.cc
@@ -58,7 +58,7 @@ bool GetDeviceInfo(const disks::DiskMountManager::MountPointInfo& mount_info,
   std::string unique_id = MakeDeviceUniqueId(*disk);
   // Keep track of device uuid and label, to see how often we receive empty
   // values.
-  base::string16 device_label = UTF8ToUTF16(disk->device_label());
+  base::string16 device_label = base::UTF8ToUTF16(disk->device_label());
   MediaStorageUtil::RecordDeviceInfoHistogram(true, unique_id, device_label);
   if (unique_id.empty())
     return false;
@@ -71,8 +71,8 @@ bool GetDeviceInfo(const disks::DiskMountManager::MountPointInfo& mount_info,
                       base::string16(),
                       mount_info.mount_path,
                       device_label,
-                      UTF8ToUTF16(disk->vendor_name()),
-                      UTF8ToUTF16(disk->product_name()),
+                      base::UTF8ToUTF16(disk->vendor_name()),
+                      base::UTF8ToUTF16(disk->product_name()),
                       disk->total_size_in_bytes());
   return true;
 }