clean-up and clarify CreatePlatformCanvas methods

skia/ext/bitmap_platform_device_mac.cc

Index: skia/ext/bitmap_platform_device_mac.cc
diff --git a/skia/ext/bitmap_platform_device_mac.cc b/skia/ext/bitmap_platform_device_mac.cc
index bf02a89a5e1bc31b930023fba91183325c104c35..ba5f81be324398effb767e19536134eceb6798c1 100644
--- a/skia/ext/bitmap_platform_device_mac.cc
+++ b/skia/ext/bitmap_platform_device_mac.cc
@@ -260,22 +260,12 @@ SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const CreateInfo& cinfo,
 
 // PlatformCanvas impl
 
-std::unique_ptr<SkCanvas> CreatePlatformCanvas(CGContextRef ctx,
-                                               int width,
-                                               int height,
-                                               bool is_opaque,
-                                               OnFailureType failureType) {
-  const bool do_clear = false;
-  sk_sp<SkBaseDevice> dev(
-      BitmapPlatformDevice::Create(ctx, width, height, is_opaque, do_clear));
-  return CreateCanvas(dev, failureType);
-}
-
-std::unique_ptr<SkCanvas> CreatePlatformCanvas(int width,
-                                               int height,
-                                               bool is_opaque,
-                                               uint8_t* data,
-                                               OnFailureType failureType) {
+std::unique_ptr<SkCanvas> CreatePlatformCanvasWithPixels(
+    int width,
+    int height,
+    bool is_opaque,
+    uint8_t* data,
+    OnFailureType failureType) {
   sk_sp<SkBaseDevice> dev(
       BitmapPlatformDevice::CreateWithData(data, width, height, is_opaque));
   return CreateCanvas(dev, failureType);