Remount all removable storage devices upon policy update

ui/file_manager/file_manager/background/js/volume_manager_impl.js

Index: ui/file_manager/file_manager/background/js/volume_manager_impl.js
diff --git a/ui/file_manager/file_manager/background/js/volume_manager_impl.js b/ui/file_manager/file_manager/background/js/volume_manager_impl.js
index 84f578aa3d0de6afb5ae97dfbaed9a54569de794..e6463becd10114417b7b114c151ee7b8a9418b04 100644
--- a/ui/file_manager/file_manager/background/js/volume_manager_impl.js
+++ b/ui/file_manager/file_manager/background/js/volume_manager_impl.js
@@ -95,8 +95,9 @@ VolumeManagerImpl.prototype.addVolumeMetadata_ = function(volumeMetadata) {
             shouldShow = !!volumeInfo.fileSystem;
             break;
         }
-        if (shouldShow &&
-            this.volumeInfoList.findIndex(volumeInfo.volumeId) === -1) {
+        if (!shouldShow)
+            return volumeInfo;
+        if (this.volumeInfoList.findIndex(volumeInfo.volumeId) === -1) {
           this.volumeInfoList.add(volumeInfo);
 
           // Update the network connection status, because until the drive is
@@ -107,6 +108,11 @@ VolumeManagerImpl.prototype.addVolumeMetadata_ = function(volumeMetadata) {
               VolumeManagerCommon.VolumeType.DRIVE) {
             this.onDriveConnectionStatusChanged_();
           }
+        } else if (volumeMetadata.volumeType ===
+            VolumeManagerCommon.VolumeType.REMOVABLE) {
+          // Update for remounted USB external storage, because they were
+          // remounted to switch read-only policy.
+          this.volumeInfoList.add(volumeInfo);
         }
         return volumeInfo;
       }.bind(this));