Rename DriveProvider to ExternalProvider.

ui/file_manager/gallery/js/gallery.js

Index: ui/file_manager/gallery/js/gallery.js
diff --git a/ui/file_manager/gallery/js/gallery.js b/ui/file_manager/gallery/js/gallery.js
index 2211d9d62dba23e36dbee959f2455ed33595f6ec..8f66af6db3cf9ec6948fbebc0e909a65ee0333f2 100644
--- a/ui/file_manager/gallery/js/gallery.js
+++ b/ui/file_manager/gallery/js/gallery.js
@@ -73,6 +73,7 @@ GalleryDataModel.prototype = {
 GalleryDataModel.prototype.saveItem = function(item, canvas, overwrite) {
   var oldEntry = item.getEntry();
   var oldMetadata = item.getMetadata();
+  var oldLocationInfo = item.getLocationInfo();
   var metadataEncoder = ImageEncoder.encodeMetadata(
       item.getMetadata(), canvas, 1 /* quality */);
   var newMetadata = ContentProvider.ConvertContentMetadata(
@@ -80,8 +81,8 @@ GalleryDataModel.prototype.saveItem = function(item, canvas, overwrite) {
       MetadataCache.cloneMetadata(item.getMetadata()));
   if (newMetadata.filesystem)
     newMetadata.filesystem.modificationTime = new Date();
-  if (newMetadata.drive)
-    newMetadata.drive.present = true;
+  if (newMetadata.external)
+    newMetadata.external.present = true;
 
   return new Promise(function(fulfill, reject) {
     item.saveToFile(
@@ -117,6 +118,7 @@ GalleryDataModel.prototype.saveItem = function(item, canvas, overwrite) {
             // Add another item for the old entry.
             var anotherItem = new Gallery.Item(
                 oldEntry,
+                oldLocationInfo,
                 oldMetadata,
                 this.metadataCache_,
                 item.isOriginal(),
@@ -254,7 +256,7 @@ Gallery.MOSAIC_BACKGROUND_INIT_DELAY = 1000;
  * @const
  * @type {string}
  */
-Gallery.METADATA_TYPE = 'thumbnail|filesystem|media|drive';
+Gallery.METADATA_TYPE = 'thumbnail|filesystem|media|external';
 
 /**
  * Initializes listeners.
@@ -489,15 +491,19 @@ Gallery.prototype.load = function(entries, selectedEntries) {
         return Promise.reject('Failed to load metadata.');
 
       // Add items to the model.
-      var items = chunk.map(function(chunkItem, index) {
-        var volumeInfo = self.volumeManager_.getVolumeInfo(chunkItem.entry);
+      var items = [];
+      chunk.forEach(function(chunkItem, index) {
+        var locationInfo = self.volumeManager_.getLocationInfo(chunkItem.entry);
+        if (!locationInfo)  // Skip the item, since gone.
+          return;
         var clonedMetadata = MetadataCache.cloneMetadata(metadataList[index]);
-        return new Gallery.Item(
+        items.push(new Gallery.Item(
             chunkItem.entry,
+            locationInfo,
             clonedMetadata,
             self.metadataCache_,
             /* original */ true,
-            /* readonly */ !!(volumeInfo && volumeInfo.isReadOnly));
+            /* readonly */ !!(locationInfo && locationInfo.isReadOnly)));
       });
       self.dataModel_.push.apply(self.dataModel_, items);
 
@@ -853,7 +859,7 @@ Gallery.prototype.updateSelectionAndState_ = function() {
       this.filenameEdit_.disabled = selectedItem.isReadOnly();
       this.filenameEdit_.value =
           ImageUtil.getDisplayNameFromName(this.selectedEntry_.name);
-      this.shareButton_.hidden = !selectedItem.isOnDrive();
+      this.shareButton_.hidden = !selectedItem.getLocationInfo().isDriveBased;
     } else {
       if (this.context_.curDirEntry) {
         // If the Gallery was opened on search results the search query will not