Remove //third_party/iaccessible2.

third_party/iaccessible2/README.chromium

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-Name: IAccessible2 COM interfaces for accessibility
-Short Name: IAccessible2
-URL: http://www.linuxfoundation.org/collaborate/workgroups/accessibility/iaccessible2
-Version: 1.3
-License: BSD
-Security Critical: yes
-
-Description:
-  This directory contains the IAccessible2 API, a set of COM interfaces
-  that extend MSAA's IAccessible interface for improved Windows accessibility.
-
-  In addition, for clients using the IAccessible2 interfaces out of process,
-  a module definition file is included for linking the COM proxy stub DLL.
-  This proxy DLL is needed to provide a description of the IAccessible2
-  interfaces to the default marshaller. This DLL is only registered and
-  used in testing.
-
-Contents:
-  ia2_api_all.idl
-    Contains the IAccessible2 COM interfaces
-
-  IAccessible2Proxy.def
-    Module definition file for linking the proxy stub DLL
-
-Local modifications:
-  None.