Use views::style for buttons, bootstrap ash_typography to do so.

ui/views/controls/button/label_button.h

Index: ui/views/controls/button/label_button.h
diff --git a/ui/views/controls/button/label_button.h b/ui/views/controls/button/label_button.h
index 6dade72706233e5cc6a2a7b7f38ed6f8ef09b358..11dd0f96e0067a7648f571f73f371253192f218d 100644
--- a/ui/views/controls/button/label_button.h
+++ b/ui/views/controls/button/label_button.h
@@ -17,6 +17,7 @@
 #include "ui/views/controls/image_view.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/native_theme_delegate.h"
+#include "ui/views/style/typography.h"
 
 namespace views {
 
@@ -33,7 +34,12 @@ class VIEWS_EXPORT LabelButton : public CustomButton,
 
   static const char kViewClassName[];
 
-  LabelButton(ButtonListener* listener, const base::string16& text);
+  // Creates a LabelButton with ButtonPressed() events sent to |listener| and
+  // label |text|. |button_context| is a value from views::style::TextContext
+  // and determines the appearance of |text|.
+  LabelButton(ButtonListener* listener,
+              const base::string16& text,
+              int button_context = style::CONTEXT_LABEL);
   ~LabelButton() override;
 
   // Gets or sets the image shown for the specified button state.
@@ -57,9 +63,6 @@ class VIEWS_EXPORT LabelButton : public CustomButton,
   // Sets whether subpixel rendering is used on the label.
   void SetTextSubpixelRenderingEnabled(bool enabled);
 
-  // Adjusts the font size up or down by the given amount.
-  virtual void AdjustFontSize(int font_size_delta);
-
   // Sets the elide behavior of this button.
   void SetElideBehavior(gfx::ElideBehavior elide_behavior);
 
@@ -116,9 +119,6 @@ class VIEWS_EXPORT LabelButton : public CustomButton,
   // these bounds if they need room to do manual painting.
   virtual gfx::Rect GetChildAreaBounds();
 
-  // Sets the font list used by this button.
-  virtual void SetFontList(const gfx::FontList& font_list);
-
   // View:
   void OnPaint(gfx::Canvas* canvas) override;
   void OnFocus() override;
@@ -193,9 +193,10 @@ class VIEWS_EXPORT LabelButton : public CustomButton,
   // drawing |label_| on a layer (which can mess with subpixel anti-aliasing).
   InkDropContainerView* ink_drop_container_;
 
-  // The cached font lists in the normal and bold style.
+  // The cached font lists in the normal and default button style. The latter
+  // may be bold.
   gfx::FontList cached_normal_font_list_;
-  gfx::FontList cached_bold_font_list_;
+  gfx::FontList cached_default_button_font_list_;
 
   // The images and colors for each button state.
   gfx::ImageSkia button_state_images_[STATE_COUNT];