Get rid of leaks in SkCodec::NewFromStream.

src/codec/SkCodec_wbmp.cpp

Index: src/codec/SkCodec_wbmp.cpp
diff --git a/src/codec/SkCodec_wbmp.cpp b/src/codec/SkCodec_wbmp.cpp
index 465c76d4dce109ed81d8c5c599ce7551d296b3c8..073165d2ca3140a3512c6323072fe2c16fcd1ad1 100644
--- a/src/codec/SkCodec_wbmp.cpp
+++ b/src/codec/SkCodec_wbmp.cpp
@@ -154,6 +154,7 @@ bool SkWbmpCodec::IsWbmp(SkStream* stream) {
 }
 
 SkCodec* SkWbmpCodec::NewFromStream(SkStream* stream) {
+    SkAutoTDelete<SkStream> streamDeleter(stream);
     SkISize size;
     if (!read_header(stream, &size)) {
         return NULL;
@@ -161,5 +162,5 @@ SkCodec* SkWbmpCodec::NewFromStream(SkStream* stream) {
     SkImageInfo info =
             SkImageInfo::Make(size.width(), size.height(), kGray_8_SkColorType,
                               kOpaque_SkAlphaType);
-    return SkNEW_ARGS(SkWbmpCodec, (info, stream));
+    return SkNEW_ARGS(SkWbmpCodec, (info, streamDeleter.detach()));
 }