Move view change analytics tracking into DirectoryModel where implementation details can be hidden.

ui/file_manager/file_manager/foreground/js/file_manager.js

Index: ui/file_manager/file_manager/foreground/js/file_manager.js
diff --git a/ui/file_manager/file_manager/foreground/js/file_manager.js b/ui/file_manager/file_manager/foreground/js/file_manager.js
index d415a1742135fc46272d9156ff8817021f519308..36a0d3d77df3cb87ca6c77e82b9b3d9a8f6ebefa 100644
--- a/ui/file_manager/file_manager/foreground/js/file_manager.js
+++ b/ui/file_manager/file_manager/foreground/js/file_manager.js
@@ -850,7 +850,8 @@ FileManager.prototype = /** @struct */ {
         this.fileFilter_,
         this.metadataModel_,
         this.volumeManager_,
-        this.fileOperationManager_);
+        this.fileOperationManager_,
+        assert(this.tracker_));
 
     this.folderShortcutsModel_ = new FolderShortcutsDataModel(
         this.volumeManager_);
@@ -861,19 +862,6 @@ FileManager.prototype = /** @struct */ {
         this.selectionHandler_.onFileSelectionChanged.bind(
             this.selectionHandler_));
 
-    this.directoryModel_.addEventListener(
-        'directory-changed',
-        function(event) {
-          if (event.volumeChanged) {
-            var volumeInfo =
-                this.volumeManager_.getVolumeInfo(event.newDirEntry);
-            // NOTE: That dynamic values, like volume name MUST NOT
-            // be sent to GA as that value can contain PII.
-            // VolumeType is an enum.
-            this.tracker_.sendAppView(volumeInfo.volumeType);
-          }
-        }.bind(this));
-
     // TODO(mtomasz, yoshiki): Create navigation list earlier, and here just
     // attach the directory model.
     this.initDirectoryTree_();