Start removing enum ui::ResourceBundle::FontStyle, fix MacViews font sizes

ui/base/default_style.h

Index: ui/base/default_style.h
diff --git a/ui/base/default_style.h b/ui/base/default_style.h
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+++ b/ui/base/default_style.h
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+// 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;
+#else
+const int kLabelFontSizeDelta = 0;
+#endif
+
+// Font size delta for dialog titles.
+#if defined(OS_MACOSX)
+const int kTitleFontSizeDelta = 0;
+#else
+const int kTitleFontSizeDelta = 3;
+#endif
+
+}  // namespace ui
+
+#endif  // UI_BASE_DEFAULT_STYLE_H_