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

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

[tfarina, 2016/02/24 20:08:55]

Thanks!

Can I move the things in
https://chromium.googlesource.com/chromium/src/+/master/chrome/browser/ui/chr...
here after this lands?

[tapted, 2016/02/25 00:21:11]

An earlier patchset did this, but the methods need
chrome/browser/themes/theme_properties.h, the `int` constants aren't yet needed
outside of chrome/browser and the FrontStyle constants should just be deleted
and users migrated over to these (since it's the deprecated type).

So, deleting the FontStyle constants in chrome_style.h is definitely on the
roadmap, but the other stuff should probably stay in chrome_style.h until we
find that it's needed elsewhere (possibly it is needed elsewhere already, and
there's some duplicated constants that should converge).

+// 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_