Show the leaf folder name as the window name.

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

Index: ui/file_manager/file_manager/foreground/js/main_window_component.js
diff --git a/ui/file_manager/file_manager/foreground/js/main_window_component.js b/ui/file_manager/file_manager/foreground/js/main_window_component.js
index 8c5576b39fa4c45aecc0fe8ea37d450b188954be..ae1a11d326a1bfa05699de943269799b10a6c762 100644
--- a/ui/file_manager/file_manager/foreground/js/main_window_component.js
+++ b/ui/file_manager/file_manager/foreground/js/main_window_component.js
@@ -411,13 +411,22 @@ MainWindowComponent.prototype.onDirectoryChanged_ = function(event) {
     this.ui_.element.removeAttribute('unformatted');
   }
 
-  // Updates UI.
-  if (this.dialogType_ === DialogType.FULL_PAGE && newVolumeInfo)
-    document.title = newVolumeInfo.label;
-  if (event.newDirEntry)
+  if (event.newDirEntry) {
     this.ui_.locationLine.show(event.newDirEntry);
-  else
+    // Updates UI.
+    if (this.dialogType_ === DialogType.FULL_PAGE) {
+      var locationInfo = this.volumeManager_.getLocationInfo(event.newDirEntry);
+      if (locationInfo) {
+        document.title = locationInfo.isRootEntry
+            ? util.getRootTypeLabel(locationInfo) : event.newDirEntry.name;
+      } else {
+        console.error('Could not find location info for entry: '
+                      + event.newDirEntry.fullPath);
+      }
+    }
+  } else {
     this.ui_.locationLine.hide();
+  }
 };
 
 /**