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

chrome/browser/ui/cocoa/passwords/credential_item_button.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/passwords/credential_item_button.h"
 
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/ui/cocoa/passwords/passwords_bubble_utils.h"
 #include "chrome/browser/ui/passwords/manage_passwords_view_utils.h"
 #include "grit/theme_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/image/image_skia_util_mac.h"
 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 
 namespace {
-const CGFloat kFocusRingLineWidth = 2;
-const CGFloat kHorizontalPaddingBetweenAvatarAndLabel = 10;
+constexpr CGFloat kFocusRingLineWidth = 2;
+constexpr CGFloat kHorizontalPaddingBetweenAvatarAndLabel = 10;
 }  // namespace
 
 // Custom button cell that adds a left padding before the avatar, and a custom
 // spacing between the avatar and label.
 @interface CredentialItemButtonCell : NSButtonCell {
  @private
   // Padding added to the left margin of the button.
   int marginSpacing_;
   // Spacing between the cell image and title.
   int imageTitleSpacing_;
@@ skipping 116 matching lines @@
 
   NSColor* backgroundColor = isHighlighted ? hoverColor_ : backgroundColor_;
   [[self cell] setBackgroundColor:backgroundColor];
 }
 
 - (BOOL)canBecomeKeyView {
   return YES;
 }
 
 @end