More Windows build fixes.

third_party/iaccessible2/README.chromium

Index: 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.