Adding support for mount point different from removable devices to MountLibrary

chrome/test/data/extensions/api_test/filebrowser_mount/test.html

Index: chrome/test/data/extensions/api_test/filebrowser_mount/test.html
===================================================================
--- chrome/test/data/extensions/api_test/filebrowser_mount/test.html	(revision 93731)
+++ chrome/test/data/extensions/api_test/filebrowser_mount/test.html	(working copy)
@@ -62,9 +62,9 @@
 };
 
 chrome.test.runTests([
- function unmountVolume() {
-    chrome.fileBrowserPrivate.unmountVolume("devicePath1");
-    // We actually check this one on C++ side. If MountLibrary.UnmountPath
+  function removeMount() {
+    chrome.fileBrowserPrivate.removeMount("devicePath1");
+    // We actually check this one on C++ side. If MountLibrary.RemoveMount
     // doesn't get called, test will fail.
     chrome.test.succeed();
   },