Revert of Use std::unique_ptr.

src/gpu/text/GrStencilAndCoverTextContext.cpp

Index: src/gpu/text/GrStencilAndCoverTextContext.cpp
diff --git a/src/gpu/text/GrStencilAndCoverTextContext.cpp b/src/gpu/text/GrStencilAndCoverTextContext.cpp
index 661f22512d41ecdf592e6452b5de97d1eb377be1..ab9025d31695dc3930f30212c51aab16216edbcb 100644
--- a/src/gpu/text/GrStencilAndCoverTextContext.cpp
+++ b/src/gpu/text/GrStencilAndCoverTextContext.cpp
@@ -329,7 +329,7 @@
 public:
     FallbackBlobBuilder() : fBuffIdx(0), fCount(0) {}
 
-    bool isInitialized() const { return fBuilder != nullptr; }
+    bool isInitialized() const { return SkToBool(fBuilder); }
 
     void init(const SkPaint& font, SkScalar textRatio);