Initial gtk3 support

chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc

Index: chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc
diff --git a/chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc b/chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc
index b7c931a5aadbb095d51b9153c4dac9ba5ac1cb14..55f3713cdb3fab372551e6e3cff3d98f5df142c6 100644
--- a/chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc
+++ b/chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc
@@ -495,41 +495,13 @@ GtkStyle* NativeThemeGtk2::GetMenuItemStyle() const {
 }
 
 void NativeThemeGtk2::PaintComboboxArrow(SkCanvas* canvas,
-                                         GtkStateType state,
+                                         GtkStateFlags state,
                                          const gfx::Rect& rect) const {
-  GdkPixmap* pm = gdk_pixmap_new(gtk_widget_get_window(GetRealizedWindow()),
-                                 rect.width(),
-                                 rect.height(),
-                                 -1);
-  // Paint the background.
-  gtk_paint_flat_box(GetWindowStyle(),
-                     pm,
-                     state,
-                     GTK_SHADOW_NONE,
-                     NULL,
-                     GetRealizedWindow(),
-                     NULL, 0, 0, rect.width(), rect.height());
-  gtk_paint_arrow(GetWindowStyle(),
-                  pm,
-                  state,
-                  GTK_SHADOW_NONE,
-                  NULL,
-                  GetRealizedWindow(),
-                  NULL,
-                  GTK_ARROW_DOWN,
-                  true,
-                  0, 0, rect.width(), rect.height());
-  GdkPixbuf* pb = gdk_pixbuf_get_from_drawable(NULL,
-                                               pm,
-                                               gdk_drawable_get_colormap(pm),
-                                               0, 0,
-                                               0, 0,
-                                               rect.width(), rect.height());
-  SkBitmap arrow = GdkPixbufToImageSkia(pb);
-  canvas->drawBitmap(arrow, rect.x(), rect.y());
+  SkBitmap arrow;
+  arrow.allocN32Pixels(rect.width(), rect.height());
+  arrow.eraseColor(0);
 
-  g_object_unref(pb);
-  g_object_unref(pm);
+  canvas->drawBitmap(arrow, rect.x(), rect.y());
 }
 
 }  // namespace libgtk2ui