Remove Uint8ClampedArray use from ImageBuffer.h ImageDataBuffer

Source/platform/graphics/ImageBuffer.cpp

Index: Source/platform/graphics/ImageBuffer.cpp
diff --git a/Source/platform/graphics/ImageBuffer.cpp b/Source/platform/graphics/ImageBuffer.cpp
index 5f941f6593bea42c2f1ae9a8c22b56adb6a82048..b055ed4fc5a730f5d9305a8475dee68d0d70ed81 100644
--- a/Source/platform/graphics/ImageBuffer.cpp
+++ b/Source/platform/graphics/ImageBuffer.cpp
@@ -401,12 +401,12 @@ String ImageBuffer::toDataURL(const String& mimeType, const double* quality) con
     return "data:" + mimeType + ";base64," + base64Encode(encodedImage);
 }
 
-String ImageDataToDataURL(const ImageDataBuffer& imageData, const String& mimeType, const double* quality)
+String ImageDataBuffer::toDataURL(const String& mimeType, const double* quality) const
 {
     ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
 
     Vector<char> encodedImage;
-    if (!encodeImage(imageData, mimeType, quality, &encodedImage))
+    if (!encodeImage(*this, mimeType, quality, &encodedImage))
         return "data:,";
 
     return "data:" + mimeType + ";base64," + base64Encode(encodedImage);