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

chrome/browser/component_updater/swiftshader_component_installer.cc

Index: chrome/browser/component_updater/swiftshader_component_installer.cc
diff --git a/chrome/browser/component_updater/swiftshader_component_installer.cc b/chrome/browser/component_updater/swiftshader_component_installer.cc
index 0dc025849b93cb6217d194407c9c984c5b3be1bb..ce54b48b1fedbf0ad60242823b7c3b4b1a409e82 100644
--- a/chrome/browser/component_updater/swiftshader_component_installer.cc
+++ b/chrome/browser/component_updater/swiftshader_component_installer.cc
@@ -17,6 +17,7 @@
 #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"
@@ -255,7 +256,7 @@ void RegisterSwiftShaderPath(ComponentUpdateService* cus) {
 }  // 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));