Change 'const' -> 'constexpr' in cocoa/passwords.

chrome/browser/ui/cocoa/passwords/account_chooser_view_controller_unittest.mm

 // Copyright 2015 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/passwords/account_chooser_view_controller.h"
 
 #include <utility>
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 25 matching lines @@
 }
 
 - (const std::vector<GURL>&)fetchedAvatars {
   return fetchedAvatars_;
 }
 
 @end
 
 namespace {
 
-const char kDialogTitle[] = "Choose an account";
+constexpr char kDialogTitle[] = "Choose an account";
 
 // Returns a PasswordForm with only a username.
 std::unique_ptr<autofill::PasswordForm> Credential(const char* username) {
   std::unique_ptr<autofill::PasswordForm> credential(
       new autofill::PasswordForm);
   credential->username_value = base::ASCIIToUTF16(username);
   return credential;
 }
 
 class PasswordDialogControllerMock : public PasswordDialogController {
@@ skipping 168 matching lines @@
   local_forms.push_back(Credential("pizza"));
   SetUpAccountChooser(&local_forms);
   [view_controller() setBridge:nil];
   [view_controller().titleView clickedOnLink:@"" atIndex:0];
   [base::mac::ObjCCastStrict<CredentialItemButton>(
       [view_controller().credentialButtons objectAtIndex:0]) performClick:nil];
   [view_controller().cancelButton performClick:nil];
 }
 
 }  // namespace