Revert of free -> reset

src/core/SkAdvancedTypefaceMetrics.h

Index: src/core/SkAdvancedTypefaceMetrics.h
diff --git a/src/core/SkAdvancedTypefaceMetrics.h b/src/core/SkAdvancedTypefaceMetrics.h
index 424e5f3f51470ba4c380624ff61baf19d7a2585e..92655d21b23dd1d4d08d4d1244563021785b62d9 100644
--- a/src/core/SkAdvancedTypefaceMetrics.h
+++ b/src/core/SkAdvancedTypefaceMetrics.h
@@ -28,12 +28,13 @@
     T*        get() const { return fPtr; }
     T* operator->() const { return fPtr; }
 
-    void reset(T* ptr = nullptr) {
+    void reset(T* ptr) {
         if (ptr != fPtr) {
             delete fPtr;
             fPtr = ptr;
         }
     }
+    void free() { this->reset(nullptr); }
     T* release() {
         T* ptr = fPtr;
         fPtr = nullptr;