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

chrome/browser/ui/android/login_prompt_android.cc

Index: chrome/browser/ui/android/login_prompt_android.cc
diff --git a/chrome/browser/ui/android/login_prompt_android.cc b/chrome/browser/ui/android/login_prompt_android.cc
index 6048f68f717921392eed1a2924fef0746c80e1f3..8dd465b7815e59f7d3acb83407a91b2cc84d55f1 100644
--- a/chrome/browser/ui/android/login_prompt_android.cc
+++ b/chrome/browser/ui/android/login_prompt_android.cc
@@ -55,8 +55,8 @@ class LoginHandlerAndroid : public LoginHandler {
 
       tab_android->OnReceivedHttpAuthRequest(
           chrome_http_auth_handler_.get()->GetJavaObject(),
-          ASCIIToUTF16(auth_info()->challenger.ToString()),
-          UTF8ToUTF16(auth_info()->realm));
+          base::ASCIIToUTF16(auth_info()->challenger.ToString()),
+          base::UTF8ToUTF16(auth_info()->realm));
 
       // Register to receive a callback to OnAutofillDataAvailable().
       SetModel(manager);