Remove IAccessible2Proxy

It was added for chrome frame testing, but chrome frame is no more.
Nothing depends on this target nowadays.

It doesn't build with clang/win, and the only reason we didn't notice
is because the 'all' target doesn't include all targets in gyp.  The
gn build gets this right.  Since this target doesn't build with
clang/win and is unused, just delete it.

BUG=82385

Review URL: https://codereview.chromium.org/1521443002

Cr-Commit-Position: refs/heads/master@{#364511}

third_party/iaccessible2/BUILD.gn

@@ -11,35 +11,3 @@ midl("iaccessible2") {
     "ia2_api_all.idl",
   ]
 }
-
-config("IAccessible2Proxy_warnings") {
-  if (is_clang) {
-    cflags = [
-      # MIDL generated code has a habit of omitting optional braces.
-      "-Wno-missing-braces",
-      "-Wno-incompatible-pointer-types",
-    ]
-  }
-}
-
-# Generate a proxy DLL from the generated code.
-shared_library("IAccessible2Proxy") {
-  sources = [
-    "$target_gen_dir/ia2_api_all.dlldata.c",
-    "$target_gen_dir/ia2_api_all_p.c",
-    "IAccessible2Proxy.def",
-  ]
-
-  configs -= [ "//build/config/compiler:chromium_code" ]
-  configs += [ "//build/config/compiler:no_chromium_code" ]
-  configs += [ ":IAccessible2Proxy_warnings" ]
-
-  defines = [ "REGISTER_PROXY_DLL" ]
-
-  libs = [ "rpcrt4.lib" ]
-
-  deps = [
-    ":iaccessible2",
-    "//build/config/sanitizers:deps",
-  ]
-}

third_party/iaccessible2/IAccessible2Proxy.def

-;IAccessible2Proxy.def
-LIBRARY              IAccessible2Proxy.dll
-EXPORTS
-   DllGetClassObject    PRIVATE
-   DllCanUnloadNow      PRIVATE
-   DllRegisterServer    PRIVATE
-   DllUnregisterServer  PRIVATE

third_party/iaccessible2/README.chromium

@@ -8,19 +8,9 @@ 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.
+  It consists of a single file:
 
-  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
+    ia2_api_all.idl
 
 Local modifications:
   None.

third_party/iaccessible2/iaccessible2.gyp

@@ -34,26 +34,5 @@
         ],
       },
     },
-    {
-      'target_name': 'IAccessible2Proxy',
-      'type': 'shared_library',
-      'defines': [ 'REGISTER_PROXY_DLL' ],
-      'dependencies': [ 'iaccessible2' ],
-      'sources': [
-        'IAccessible2Proxy.def',
-        '<(midl_out_dir)/dlldata.c',
-        '<(midl_out_dir)/ia2_api_all_p.c',
-      ],
-      'link_settings': {
-        'libraries': [
-          '-lrpcrt4.lib',
-        ],
-      },
-      'variables': {
-        'clang_warning_flags': [
-          '-Wno-incompatible-pointer-types',
-        ]
-      },
-    },
   ],
 }