clang/win: Fix most -Wunused-function warnings in Chromium code.

chrome/installer/util/shell_util.cc

 // Copyright (c) 2012 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.
 //
 // This file defines functions that integrate Chrome in Windows shell. These
 // functions can be used by Chrome as well as Chrome installer. All of the
 // work is done by the local functions defined in anonymous namespace in
 // this class.
 
 #include "chrome/installer/util/shell_util.h"
@@ skipping 903 matching lines @@
       OAIF_URL_PROTOCOL | OAIF_FORCE_REGISTRATION | OAIF_REGISTER_EXT;
   HRESULT hr = SHOpenWithDialog(NULL, &open_as_info);
   DLOG_IF(WARNING, FAILED(hr)) << "Failed to set as default " << protocol
       << " handler; hr=0x" << std::hex << hr;
   if (FAILED(hr))
     return false;
   SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, NULL, NULL);
   return true;
 }
 
-// Launches the Windows 7 and Windows 8 application association dialog, which
-// is the only documented way to make a browser the default browser on
-// Windows 8.
-bool LaunchApplicationAssociationDialog(const base::string16& app_id) {
-  base::win::ScopedComPtr<IApplicationAssociationRegistrationUI> aarui;
-  HRESULT hr = aarui.CreateInstance(CLSID_ApplicationAssociationRegistrationUI);
-  if (FAILED(hr))
-    return false;
-  hr = aarui->LaunchAdvancedAssociationUI(app_id.c_str());
-  return SUCCEEDED(hr);
-}
-
 // Returns true if the current install's |chrome_exe| has been registered with
 // |suffix|.
 // |confirmation_level| is the level of verification desired as described in
 // the RegistrationConfirmationLevel enum above.
 // |suffix| can be the empty string (this is used to support old installs
 // where we used to not suffix user-level installs if they were the first to
 // request the non-suffixed registry entries on the machine).
 // NOTE: This a quick check that only validates that a single registry entry
 // points to |chrome_exe|. This should only be used at run-time to determine
 // how Chrome is registered, not to know whether the registration is complete
@@ skipping 1568 matching lines @@
   base::string16 key_path(ShellUtil::kRegClasses);
   key_path.push_back(base::FilePath::kSeparators[0]);
   key_path.append(prog_id);
   return InstallUtil::DeleteRegistryKey(
       HKEY_CURRENT_USER, key_path, WorkItem::kWow64Default);
 
   // TODO(mgiuca): Remove the extension association entries. This requires that
   // the extensions associated with a particular prog_id are stored in that
   // prog_id's key.
 }