MacViews: Bump up the default font sizes for dialogs to 12pt.

ui/base/default_style.h

 // 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.
 
 #ifndef UI_BASE_DEFAULT_STYLE_H_
 #define UI_BASE_DEFAULT_STYLE_H_
 
 #include "build/build_config.h"
 
 // This file contains the constants that provide the default style for UI
 // controls and dialogs.
 
 namespace ui {
 
 // Default font size delta for messages in dialogs. Note that on Windows, the
 // "base" font size is determined by consulting the system for the font used in
 // native MessageBox dialogs. On Mac, it is [NSFont systemFontSize]. Linux
 // consults the default font description for a GTK Widget context. On ChromeOS,
 // ui::ResourceBundle provides a description via IDS_UI_FONT_FAMILY_CROS.
 const int kMessageFontSizeDelta = 0;
 
 // Default font size delta for dialog buttons, textfields, and labels.
 #if defined(OS_MACOSX)
-// Cocoa dialogs prefer [NSFont smallSystemFontSize] for labels (typically 11pt
-// vs 13pt).
-const int kLabelFontSizeDelta = -2;
+// Aim for 12pt for Cocoa labels ([NSFont systemFontSize] is typically 13pt).
+const int kLabelFontSizeDelta = -1;
 #else
 const int kLabelFontSizeDelta = 0;
 #endif
 
 // Font size delta for dialog titles.
 #if defined(OS_MACOSX)
-const int kTitleFontSizeDelta = 0;
+const int kTitleFontSizeDelta = 1;
 #else
 const int kTitleFontSizeDelta = 3;
 #endif
 
 }  // namespace ui
 
 #endif  // UI_BASE_DEFAULT_STYLE_H_