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

chrome/browser/ui/cocoa/ssl_client_certificate_selector_cocoa.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/ssl_client_certificate_selector_cocoa.h"
 
 #import <SecurityInterface/SFChooseIdentityPanel.h>
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
@@ skipping 125 matching lines @@
     if (SecIdentityCreateWithCertificate(NULL, cert, &identity) == noErr) {
       CFArrayAppendValue(identities_, identity);
       CFRelease(identity);
       certificates_.push_back(observer_->cert_request_info()->client_certs[i]);
     }
   }
 
   // Get the message to display:
   NSString* message = l10n_util::GetNSStringF(
       IDS_CLIENT_CERT_DIALOG_TEXT,
-      ASCIIToUTF16(observer_->cert_request_info()->host_and_port.ToString()));
+      base::ASCIIToUTF16(
+          observer_->cert_request_info()->host_and_port.ToString()));
 
   // Create and set up a system choose-identity panel.
   panel_.reset([[SFChooseIdentityPanel alloc] init]);
   [panel_ setInformativeText:message];
   [panel_ setDefaultButtonTitle:l10n_util::GetNSString(IDS_OK)];
   [panel_ setAlternateButtonTitle:l10n_util::GetNSString(IDS_CANCEL)];
   SecPolicyRef sslPolicy;
   if (net::x509_util::CreateSSLClientPolicy(&sslPolicy) == noErr) {
     [panel_ setPolicies:(id)sslPolicy];
     CFRelease(sslPolicy);
@@ skipping 73 matching lines @@
 }
 
 - (void)onConstrainedWindowClosed {
   observer_->StopObserving();
   panel_.reset();
   constrainedWindow_.reset();
   [self release];
 }
 
 @end