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

views/window/custom_frame_view.cc

Index: views/window/custom_frame_view.cc
===================================================================
--- views/window/custom_frame_view.cc	(revision 55911)
+++ views/window/custom_frame_view.cc	(working copy)
@@ -280,7 +280,7 @@
   // size are increased.
   return GetSystemMetrics(SM_CYSMICON);
 #else
-  return std::max(title_font_->height(), kIconMinimumSize);
+  return std::max(title_font_->GetHeight(), kIconMinimumSize);
 #endif
 }
 
@@ -541,7 +541,7 @@
   // Size the title.
   int title_x = d->ShouldShowWindowIcon() ?
       icon_bounds.right() + kIconTitleSpacing : icon_bounds.x();
-  int title_height = title_font_->height();
+  int title_height = title_font_->GetHeight();
   // We bias the title position so that when the difference between the icon and
   // title heights is odd, the extra pixel of the title is above the vertical
   // midline rather than below.  This compensates for how the icon is already