SkMatrix44(const SkMatrix&) needs to initialize the type mask

Review URL: https://codereview.chromium.org/791723006
diff --git a/src/utils/SkMatrix44.cpp b/src/utils/SkMatrix44.cpp
index 1835635..731cb41 100644
--- a/src/utils/SkMatrix44.cpp
+++ b/src/utils/SkMatrix44.cpp
@@ -939,7 +939,7 @@
 }
 
 SkMatrix44::SkMatrix44(const SkMatrix& src) {
-    initFromMatrix(fMat, src);
+    this->operator=(src);
 }
 
 SkMatrix44& SkMatrix44::operator=(const SkMatrix& src) {