Fix a proto-type mismatch on a virtual override.

src/base/gfx/platform_canvas_linux.h

Index: src/base/gfx/platform_canvas_linux.h
diff --git a/src/base/gfx/platform_canvas_linux.h b/src/base/gfx/platform_canvas_linux.h
index e13207ee8cac9207607a8eda71cf77f42db433b9..804c6b67dd2d2befff29f555fe66e9853be9f41b 100644
--- a/src/base/gfx/platform_canvas_linux.h
+++ b/src/base/gfx/platform_canvas_linux.h
@@ -37,7 +37,7 @@ class PlatformCanvasLinux : public SkCanvas {
   // the device is always our own so we know that we can use GDI operations
   // on it. Simply calls into createPlatformDevice().
   virtual SkDevice* createDevice(SkBitmap::Config, int width, int height,
-                                 bool is_opaque);
+                                 bool is_opaque, bool isForLayer);
 
   // Creates a device store for use by the canvas. By default, it creates a
   // BitmapPlatformDevice object. Can be overridden to change the object type.