Implement DeleteFile and DeleteDirectory.

chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h

Index: chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h
diff --git a/chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h b/chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h
index 79555a38185152ff0681dcf659278d2902cdcf27..669b14aae2ee159885fe6beeb67635f8a41db99a 100644
--- a/chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h
+++ b/chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h
@@ -66,6 +66,12 @@ class MTPDeviceAsyncDelegate {
   // A callback to be called when CopyFileFromLocal method call succeeds.
   typedef base::Closure CopyFileFromLocalSuccessCallback;
 
+  // A callback to be called when DeleteFile method call succeeds.
+  typedef base::Closure DeleteFileSuccessCallback;
+
+  // A callback to be called when DeleteDirectory method call succeeds.
+  typedef base::Closure DeleteDirectorySuccessCallback;
+
   // Gets information about the given |file_path| and invokes the appropriate
   // callback asynchronously when complete.
   virtual void GetFileInfo(
@@ -103,7 +109,7 @@ class MTPDeviceAsyncDelegate {
                          const ErrorCallback& error_callback) = 0;
 
   // Returns true if storage is opened for read only.
-  virtual bool IsReadOnly() = 0;
+  virtual bool IsReadOnly() const = 0;
 
   // Copies a file from |source_file_path| to |device_file_path|.
   virtual void CopyFileFromLocal(
@@ -112,6 +118,17 @@ class MTPDeviceAsyncDelegate {
       const CopyFileFromLocalSuccessCallback& success_callback,
       const ErrorCallback& error_callback) = 0;
 
+  // Deletes a file at |file_path|.
+  virtual void DeleteFile(const base::FilePath& file_path,
+                          const DeleteFileSuccessCallback& success_callback,
+                          const ErrorCallback& error_callback) = 0;
+
+  // Deletes a directory at |file_path|. The directory must be empty.
+  virtual void DeleteDirectory(
+      const base::FilePath& file_path,
+      const DeleteDirectorySuccessCallback& success_callback,
+      const ErrorCallback& error_callback) = 0;
+
   // Called when the
   // (1) Browser application is in shutdown mode (or)
   // (2) Last extension using this MTP device is destroyed (or)