Rewrite SkTRegistry to take any trivially-copyable type.

src/images/SkImageDecoder_libpng.cpp

Index: src/images/SkImageDecoder_libpng.cpp
diff --git a/src/images/SkImageDecoder_libpng.cpp b/src/images/SkImageDecoder_libpng.cpp
index c188a2fabc4ef93c21c899c7a6173b053bcc93ee..56c19fd98cb6d9a8837dfa9fbec5ea6ab507c145 100644
--- a/src/images/SkImageDecoder_libpng.cpp
+++ b/src/images/SkImageDecoder_libpng.cpp
@@ -1174,8 +1174,6 @@ DEFINE_DECODER_CREATOR(PNGImageDecoder);
 DEFINE_ENCODER_CREATOR(PNGImageEncoder);
 ///////////////////////////////////////////////////////////////////////////////
 
-#include "SkTRegistry.h"
-
 static bool is_png(SkStream* stream) {
     char buf[PNG_BYTES_TO_CHECK];
     if (stream->read(buf, PNG_BYTES_TO_CHECK) == PNG_BYTES_TO_CHECK &&
@@ -1203,6 +1201,6 @@ SkImageEncoder* sk_libpng_efactory(SkImageEncoder::Type t) {
     return (SkImageEncoder::kPNG_Type == t) ? SkNEW(SkPNGImageEncoder) : NULL;
 }
 
-static SkTRegistry<SkImageEncoder*, SkImageEncoder::Type> gEReg(sk_libpng_efactory);
-static SkTRegistry<SkImageDecoder::Format, SkStream*> gFormatReg(get_format_png);
-static SkTRegistry<SkImageDecoder*, SkStream*> gDReg(sk_libpng_dfactory);
+static SkImageDecoder_DecodeReg gDReg(sk_libpng_dfactory);
+static SkImageDecoder_FormatReg gFormatReg(get_format_png);
+static SkImageEncoder_EncodeReg gEReg(sk_libpng_efactory);