Use SkCanvs::writePixels instead of deprecated SkDevice::writePixels.

chrome/renderer/chrome_ppb_pdf_impl.cc

Index: chrome/renderer/chrome_ppb_pdf_impl.cc
===================================================================
--- chrome/renderer/chrome_ppb_pdf_impl.cc	(revision 109621)
+++ chrome/renderer/chrome_ppb_pdf_impl.cc	(working copy)
@@ -178,7 +178,7 @@
   skia::PlatformCanvas* canvas = image_data->mapped_canvas();
   // Note: Do not skBitmap::copyTo the canvas bitmap directly because it will
   // ignore the allocated pixels in shared memory and re-allocate a new buffer.
-  skia::GetTopDevice(*canvas)->writePixels(*res_bitmap, 0, 0);
+  canvas->writePixels(*res_bitmap, 0, 0);
 
   return image_data->GetReference();
 }