Rework gfx::Font by moving platform-specific code into inner classes....

views/controls/button/text_button.cc

Index: views/controls/button/text_button.cc
===================================================================
--- views/controls/button/text_button.cc	(revision 55911)
+++ views/controls/button/text_button.cc	(working copy)
@@ -390,7 +390,7 @@
   gfx::CanvasSkia::SizeStringInt(
       text_, font_, &width, &height,
       gfx::Canvas::NO_ELLIPSIS | PrefixTypeToCanvasType(prefix_type_));
-  text_size_.SetSize(width, font_.height());
+  text_size_.SetSize(width, font_.GetHeight());
   max_text_size_.SetSize(std::max(max_text_size_.width(), text_size_.width()),
                          std::max(max_text_size_.height(),
                                   text_size_.height()));