Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/signin/signin_ui_util.cc

Index: chrome/browser/signin/signin_ui_util.cc
diff --git a/chrome/browser/signin/signin_ui_util.cc b/chrome/browser/signin/signin_ui_util.cc
index 818bd4cb1cfa8728afe5e41f29eedbd77d3b216f..314f67b1010fc778778322b38a26d16d70363aa0 100644
--- a/chrome/browser/signin/signin_ui_util.cc
+++ b/chrome/browser/signin/signin_ui_util.cc
@@ -75,9 +75,8 @@ base::string16 GetSigninMenuLabel(Profile* profile) {
     if (signin_manager)
       username = signin_manager->GetAuthenticatedUsername();
     if (!username.empty() && !signin_manager->AuthInProgress()) {
-      base::string16 elided_username = gfx::ElideEmail(UTF8ToUTF16(username),
-                                                 gfx::FontList(),
-                                                 kUsernameMaxWidth);
+      base::string16 elided_username = gfx::ElideEmail(
+          base::UTF8ToUTF16(username), gfx::FontList(), kUsernameMaxWidth);
       return l10n_util::GetStringFUTF16(IDS_SYNC_MENU_SYNCED_LABEL,
                                         elided_username);
     }
@@ -93,7 +92,7 @@ void GetStatusLabelsForAuthError(Profile* profile,
                                  base::string16* status_label,
                                  base::string16* link_label) {
   base::string16 username =
-      UTF8ToUTF16(signin_manager.GetAuthenticatedUsername());
+      base::UTF8ToUTF16(signin_manager.GetAuthenticatedUsername());
   base::string16 product_name = l10n_util::GetStringUTF16(IDS_PRODUCT_NAME);
   if (link_label)
     link_label->assign(l10n_util::GetStringUTF16(IDS_SYNC_RELOGIN_LINK_LABEL));