Add a 32-bit/64-bit string to chrome://version.

chrome/browser/ui/webui/version_ui.cc

Index: chrome/browser/ui/webui/version_ui.cc
diff --git a/chrome/browser/ui/webui/version_ui.cc b/chrome/browser/ui/webui/version_ui.cc
index c79d6ca89fdccacd16f1fe52c2e4b4a24608883c..472d6e17b8aa9a1b4845402b6413eaf965f8fc59 100644
--- a/chrome/browser/ui/webui/version_ui.cc
+++ b/chrome/browser/ui/webui/version_ui.cc
@@ -83,6 +83,11 @@ WebUIDataSource* CreateVersionUIDataSource() {
   html_source->AddLocalizedString("official",
       version_info.IsOfficialBuild() ? IDS_ABOUT_VERSION_OFFICIAL :
                                        IDS_ABOUT_VERSION_UNOFFICIAL);
+#if defined(ARCH_CPU_64_BITS)
+  html_source->AddLocalizedString("version_bitsize", IDS_ABOUT_VERSION_64BIT);
+#else
+  html_source->AddLocalizedString("version_bitsize", IDS_ABOUT_VERSION_32BIT);
+#endif
   html_source->AddLocalizedString("user_agent_name",
                                   IDS_ABOUT_VERSION_USER_AGENT);
   html_source->AddString("useragent", GetUserAgent());