Change WebBluetooth chooser OK button's label to be "Pair"

chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm

 // Copyright 2016 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/chooser_content_view_cocoa.h"
 
 #include <algorithm>
 
 #include "base/macros.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 246 matching lines @@
   base::scoped_nsobject<NSButton> button(
       [[ConstrainedWindowButton alloc] initWithFrame:NSZeroRect]);
   [button setButtonType:NSMomentaryPushInButton];
   [button setTitle:title];
   [button sizeToFit];
   return button;
 }
 
 - (base::scoped_nsobject<NSButton>)createConnectButton {
   NSString* connectTitle =
-      l10n_util::GetNSString(IDS_DEVICE_CHOOSER_CONNECT_BUTTON_TEXT);
+      base::SysUTF16ToNSString(chooserController_->GetOkButtonLabel());
   return [self createButtonWithTitle:connectTitle];
 }
 
 - (base::scoped_nsobject<NSButton>)createCancelButton {
   NSString* cancelTitle =
       l10n_util::GetNSString(IDS_DEVICE_CHOOSER_CANCEL_BUTTON_TEXT);
   return [self createButtonWithTitle:cancelTitle];
 }
 
 - (base::scoped_nsobject<NSBox>)createSeparator {
@@ skipping 83 matching lines @@
 
 - (void)close {
   chooserController_->Close();
 }
 
 - (void)onHelpPressed:(id)sender {
   chooserController_->OpenHelpCenterUrl();
 }
 
 @end