Use sk_sp<SkBitmap::Allocator> instead of raw pointers or WTF::RefPtr<T>.

third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp

Index: third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp
diff --git a/third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp b/third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp
index 6a4db8fa2d711b56af64eac34f940d4fd870781b..ed3619a09c52a4fc30670ce2cbade31f45307e39 100644
--- a/third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp
+++ b/third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp
@@ -32,7 +32,7 @@
 namespace blink {
 
 ImageFrame::ImageFrame()
-    : m_allocator(0)
+    : m_allocator(nullptr)
     , m_hasAlpha(true)
     , m_status(FrameEmpty)
     , m_duration(0)
@@ -107,7 +107,7 @@ bool ImageFrame::setSizeAndColorProfile(int newWidth, int newHeight, const ICCPr
 
     m_bitmap.setInfo(SkImageInfo::MakeN32(newWidth, newHeight,
         m_premultiplyAlpha ? kPremul_SkAlphaType : kUnpremul_SkAlphaType, colorSpace));
-    if (!m_bitmap.tryAllocPixels(m_allocator, 0))
+    if (!m_bitmap.tryAllocPixels(m_allocator.get(), 0))
         return false;
 
     zeroFillPixelData();