Revert of Revert of clang/win: Fix a few warnings in targets not in chromium_builder_tests.

chrome/installer/gcapi/gcapi.h

 // 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.
 
 #ifndef CHROME_INSTALLER_GCAPI_GCAPI_H_
 #define CHROME_INSTALLER_GCAPI_GCAPI_H_
 
 #include <windows.h>
 
 // Error conditions for GoogleChromeCompatibilityCheck().
@@ skipping 95 matching lines @@
 BOOL __stdcall CanOfferReactivation(const wchar_t* brand_code,
                                     int shell_mode,
                                     DWORD* error_code);
 
 // Attempts to reactivate Chrome for the specified |brand_code|. Returns false
 // if reactivation fails, and places one of the REACTIVATE_ERROR_XXX values
 // in |error_code| if |error_code| is non-null.
 // |shell_mode| should be set to one of GCAPI_INVOKED_STANDARD_SHELL or
 // GCAPI_INVOKED_UAC_ELEVATION depending on whether this method is invoked
 // from an elevated or non-elevated process.
-BOOL __stdcall ReactivateChrome(wchar_t* brand_code,
+BOOL __stdcall ReactivateChrome(const wchar_t* brand_code,
                                 int shell_mode,
                                 DWORD* error_code);
 
 // Returns true if a vendor may offer relaunch at this time. Returns false if
 // the vendor may not offer relaunching at this time, and places one of the
 // RELAUNCH_ERROR_XXX values in |error_code| if |error_code| is non-null. The
 // installed brandcode must be in |partner_brandcode_list|. |shell_mode| should
 // be set to one of GCAPI_INVOKED_STANDARD_SHELL or GCAPI_INVOKED_UAC_ELEVATION
 // depending on whether this method is invoked from an elevated or non-elevated
 // process.
@@ skipping 37 matching lines @@
                                                   int,
                                                   const wchar_t*,
                                                   int,
                                                   DWORD*);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // CHROME_INSTALLER_GCAPI_GCAPI_H_