Don't attempt to get SwiftShader from component updater on x86-64.

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>
 
 #include "base/base_paths.h"
 #include "base/bind.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
+#include "build/build_config.h"
 #include "components/component_updater/component_updater_paths.h"
 #include "components/component_updater/component_updater_service.h"
 #include "components/update_client/update_client.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "content/public/browser/gpu_data_manager_observer.h"
 #include "gpu/config/gpu_feature_type.h"
 
 using content::BrowserThread;
 using content::GpuDataManager;
@@ skipping 218 matching lines @@
        ++iter) {
     base::DeleteFile(*iter, true);
   }
 }
 
 #endif  // ENABLE_SWIFTSHADER
 
 }  // namespace
 
 void RegisterSwiftShaderComponent(ComponentUpdateService* cus) {
-#if defined(ENABLE_SWIFTSHADER)
+#if defined(ENABLE_SWIFTSHADER) && defined(ARCH_CPU_X86)
   BrowserThread::PostTask(BrowserThread::FILE,
                           FROM_HERE,
                           base::Bind(&RegisterSwiftShaderPath, cus));
 #endif
 }
 
 }  // namespace component_updater