Simplify platform_canvas.h by recognizing that PlatformCanvas does not actually extend

skia/ext/platform_canvas_linux.cc

Index: skia/ext/platform_canvas_linux.cc
===================================================================
--- skia/ext/platform_canvas_linux.cc	(revision 165342)
+++ skia/ext/platform_canvas_linux.cc	(working copy)
@@ -11,28 +11,4 @@
 
 namespace skia {
 
-PlatformCanvas::PlatformCanvas(int width, int height, bool is_opaque) {
-  TRACE_EVENT2("skia", "PlatformCanvas::PlatformCanvas",
-               "width", width, "height", height);
-  if (!initialize(width, height, is_opaque))
-    SK_CRASH();
-}
-
-PlatformCanvas::PlatformCanvas(int width, int height, bool is_opaque,
-                               uint8_t* data) {
-  TRACE_EVENT2("skia", "PlatformCanvas::PlatformCanvas",
-               "width", width, "height", height);
-  if (!initialize(width, height, is_opaque, data))
-    SK_CRASH();
-}
-
-PlatformCanvas::~PlatformCanvas() {
-}
-
-bool PlatformCanvas::initialize(int width, int height, bool is_opaque,
-                                uint8_t* data) {
-  return initializeWithDevice(BitmapPlatformDevice::Create(
-      width, height, is_opaque, data));
-}
-
 }  // namespace skia