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

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac_unittest.mm

Index: chrome/browser/ui/cocoa/omnibox/omnibox_view_mac_unittest.mm
diff --git a/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac_unittest.mm b/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac_unittest.mm
index 2c60503c8d8b570827ed82da4bc59ad8b1e2a34d..2ad516b633a61c8ef884dd6b1c88e084c810ab21 100644
--- a/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac_unittest.mm
+++ b/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac_unittest.mm
@@ -159,11 +159,11 @@ TEST_F(OmniboxViewMacTest, SetGrayTextAutocompletion) {
   MockOmniboxPopupView popup_view;
   OmniboxPopupModel popup_model(&popup_view, model);
 
-  view.SetUserText(ASCIIToUTF16("Alfred"));
-  EXPECT_EQ("Alfred", UTF16ToUTF8(view.GetText()));
-  view.SetGrayTextAutocompletion(ASCIIToUTF16(" Hitchcock"));
-  EXPECT_EQ("Alfred", UTF16ToUTF8(view.GetText()));
-  EXPECT_EQ(" Hitchcock", UTF16ToUTF8(view.GetGrayTextAutocompletion()));
+  view.SetUserText(base::ASCIIToUTF16("Alfred"));
+  EXPECT_EQ("Alfred", base::UTF16ToUTF8(view.GetText()));
+  view.SetGrayTextAutocompletion(base::ASCIIToUTF16(" Hitchcock"));
+  EXPECT_EQ("Alfred", base::UTF16ToUTF8(view.GetText()));
+  EXPECT_EQ(" Hitchcock", base::UTF16ToUTF8(view.GetGrayTextAutocompletion()));
 
   view.SetUserText(base::string16());
   EXPECT_EQ(base::string16(), view.GetText());