clang/win/x64: Fix official build after https://codereview.chromium.org/2512783005

chrome/browser/component_updater/swiftshader_component_installer.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.
 
 #include "chrome/browser/component_updater/swiftshader_component_installer.h"
 
 #include <stdint.h>
 #include <string>
 #include <vector>
 
@@ skipping 215 matching lines @@
     base::Version version(kNullVersion);
     GetLatestSwiftShaderDirectory(&path, &version, NULL);
 
     BrowserThread::PostTask(
         BrowserThread::UI,
         FROM_HERE,
         base::Bind(&FinishSwiftShaderUpdateRegistration, cus_, version));
   }
 }
 
-#if BUILDFLAG(ENABLE_SWIFTSHADER)
+#if BUILDFLAG(ENABLE_SWIFTSHADER) && defined(ARCH_CPU_X86)
 
 // Check if there already is a version of swiftshader installed,
 // and if so register it.
 void RegisterSwiftShaderPath(ComponentUpdateService* cus) {
   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
   base::FilePath path = GetSwiftShaderBaseDirectory();
   if (!base::PathExists(path)) {
     if (!base::CreateDirectory(path)) {
       NOTREACHED() << "Could not create SwiftShader directory.";
       return;
@@ skipping 27 matching lines @@
 
 void RegisterSwiftShaderComponent(ComponentUpdateService* cus) {
 #if BUILDFLAG(ENABLE_SWIFTSHADER) && defined(ARCH_CPU_X86)
   BrowserThread::PostTask(BrowserThread::FILE,
                           FROM_HERE,
                           base::Bind(&RegisterSwiftShaderPath, cus));
 #endif
 }
 
 }  // namespace component_updater