Add more string_util functions to base namespace.

ios/chrome/browser/infobars/confirm_infobar_controller.mm

 // Copyright 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.
 
 #include "ios/chrome/browser/infobars/confirm_infobar_controller.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
@@ skipping 97 matching lines @@
 
 - (void)updateInfobarLabel:(UIView<InfoBarViewProtocol>*)view {
   if (!confirmInfobarDelegate_->GetMessageText().length())
     return;
   if (confirmInfobarDelegate_->GetLinkText().length()) {
     base::string16 msgLink = base::SysNSStringToUTF16(
         [[view class] stringAsLink:base::SysUTF16ToNSString(
                                        confirmInfobarDelegate_->GetLinkText())
                                tag:ConfirmInfoBarUITags::TITLE_LINK]);
     base::string16 messageText = confirmInfobarDelegate_->GetMessageText();
-    ReplaceFirstSubstringAfterOffset(
+    base::ReplaceFirstSubstringAfterOffset(
         &messageText, 0, confirmInfobarDelegate_->GetLinkText(), msgLink);
 
     [view addLabel:base::SysUTF16ToNSString(messageText)
             target:self
             action:@selector(infobarLinkDidPress:)];
   } else {
     NSString* label =
         base::SysUTF16ToNSString(confirmInfobarDelegate_->GetMessageText());
     [view addLabel:label];
   }
@@ skipping 22 matching lines @@
   DCHECK([tag isKindOfClass:[NSNumber class]]);
   if (!self.delegate) {
     return;
   }
   if ([tag unsignedIntegerValue] == ConfirmInfoBarUITags::TITLE_LINK) {
     confirmInfobarDelegate_->LinkClicked(NEW_FOREGROUND_TAB);
   }
 }
 
 @end