Files.app: Remove getDriveFiles function from the private API.

chrome/common/extensions/api/file_manager_private.idl

Index: chrome/common/extensions/api/file_manager_private.idl
diff --git a/chrome/common/extensions/api/file_manager_private.idl b/chrome/common/extensions/api/file_manager_private.idl
index 3ee6df5bb8fb2ab81f6b541537d5917c0b62967f..403e4add78b43fbf8c8d35d186fb1a25e80c76ee 100644
--- a/chrome/common/extensions/api/file_manager_private.idl
+++ b/chrome/common/extensions/api/file_manager_private.idl
@@ -488,10 +488,6 @@ callback RequestFileSystemCallback = void(optional object fileSystem);
 callback GetEntryPropertiesCallback =
     void(EntryProperties[] entryProperties);
 
-// |localFilePaths| An array of the local file paths for the requested files,
-// one entry for each file in fileUrls.
-callback GetDriveFilesCallback = void(DOMString[] localFilePaths);
-
 // |sourcePath| Source path of the mount.
 callback AddMountCallback = void(DOMString sourcePath);
 
@@ -648,12 +644,6 @@ interface Functions {
                            boolean pin,
                            optional SimpleCallback callback);
 
-  // Get Drive files.
-  // |fileUrls| Array of Drive file URLs to get.
-  // |callback|
-  static void getDriveFiles(DOMString[] fileUrls,
-                            GetDriveFilesCallback callback);
-
   // Resolves file entries in the isolated file system and returns corresponding
   // entries in the external file system mounted to Chrome OS file manager
   // backend. If resolving entry fails, the entry will be just ignored and the