clean-up and clarify CreatePlatformCanvas methods

ui/surface/transport_dib_win.cc

Index: ui/surface/transport_dib_win.cc
diff --git a/ui/surface/transport_dib_win.cc b/ui/surface/transport_dib_win.cc
index 61f5a1b24295e639effc3650bed1965dd05d828f..f845480620fb0ad3033ab6de318217bdc2bf560a 100644
--- a/ui/surface/transport_dib_win.cc
+++ b/ui/surface/transport_dib_win.cc
@@ -68,9 +68,10 @@ std::unique_ptr<SkCanvas> TransportDIB::GetPlatformCanvas(int w,
   // We can't check the canvas size before mapping, but it's safe because
   // Windows will fail to map the section if the dimensions of the canvas
   // are too large.
-  std::unique_ptr<SkCanvas> canvas = skia::CreatePlatformCanvas(
-      w, h, opaque, shared_memory_.handle().GetHandle(),
-      skia::RETURN_NULL_ON_FAILURE);
+  std::unique_ptr<SkCanvas> canvas =
+      skia::CreatePlatformCanvasWithSharedSection(
+          w, h, opaque, shared_memory_.handle().GetHandle(),
+          skia::RETURN_NULL_ON_FAILURE);
 
   // Calculate the size for the memory region backing the canvas.
   if (canvas)