Revert "ShellPkg: Make the USB mouse behavior in 'edit' consistent with 'hexedit'."

This reverts commit ee60bd2b6a and
e36ed7a84b.
The two commits enhanced 'edit' to support text selection through
mouse. But the code introduced some bugs resulting the text
selection behavior is not very usable and potentially hang in
certain platforms.

So I'd like to revert them firstly. If there is strong
requirement for the text selection through mouse in 'edit'
I will refine and re-add the code.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni　<ruiyu.ni@intel.com>
Reviewed-by: Jaben Carsey <jarben.carsey@intel.com>

ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.h

@@ -1,7 +1,7 @@
 /** @file
   Declares filebuffer interface functions.
 
-  Copyright (c) 2005 - 2016, Intel Corporation. All rights reserved. <BR>
+  Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved. <BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -260,14 +260,4 @@ FileBufferSetModified (
   VOID
   );
 
-/**
-  Get the size of the open buffer.
-
-  @retval The size in bytes.
-**/
-UINTN
-FileBufferGetTotalSize (
-  VOID
-  );
-
 #endif