Fix SkData leaks at GrResourceKey::setCustomData() call sites.

BUG=skia:
TBR=bsalomon@google.com

Review URL: https://codereview.chromium.org/1270103003 .
diff --git a/src/gpu/GrTessellatingPathRenderer.cpp b/src/gpu/GrTessellatingPathRenderer.cpp
index 5d83dd7..62b8f0e 100644
--- a/src/gpu/GrTessellatingPathRenderer.cpp
+++ b/src/gpu/GrTessellatingPathRenderer.cpp
@@ -1489,7 +1489,8 @@
             TessInfo info;
             info.fTolerance = isLinear ? 0 : tol;
             info.fCount = actualCount;
-            key->setCustomData(SkData::NewWithCopy(&info, sizeof(info)));
+            SkAutoTUnref<SkData> data(SkData::NewWithCopy(&info, sizeof(info)));
+            key->setCustomData(data.get());
             resourceProvider->assignUniqueKeyToResource(*key, vertexBuffer.get());
             SkPathPriv::AddGenIDChangeListener(fPath, SkNEW(PathInvalidator(*key)));
         }