Split out the MSCOM pieces of BrowserAccessibilityWin into a seperate class.

content/browser/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//gpu/vulkan/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
@@ skipping 217 matching lines @@
     "accessibility/accessibility_tree_formatter_utils_win.h",
     "accessibility/accessibility_tree_formatter_win.cc",
     "accessibility/accessibility_ui.cc",
     "accessibility/accessibility_ui.h",
     "accessibility/ax_platform_position.cc",
     "accessibility/ax_platform_position.h",
     "accessibility/browser_accessibility.cc",
     "accessibility/browser_accessibility.h",
     "accessibility/browser_accessibility_cocoa.h",
     "accessibility/browser_accessibility_cocoa.mm",
+    "accessibility/browser_accessibility_com_win.cc",
+    "accessibility/browser_accessibility_com_win.h",
     "accessibility/browser_accessibility_event.cc",
     "accessibility/browser_accessibility_event.h",
     "accessibility/browser_accessibility_event_win.cc",
     "accessibility/browser_accessibility_event_win.h",
     "accessibility/browser_accessibility_mac.h",
     "accessibility/browser_accessibility_mac.mm",
     "accessibility/browser_accessibility_manager.cc",
     "accessibility/browser_accessibility_manager.h",
     "accessibility/browser_accessibility_manager_mac.h",
     "accessibility/browser_accessibility_manager_mac.mm",
@@ skipping 1881 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }