Make GrFragmentProcessor be non-refcounted and use std::unique_ptr.

Change-Id: I985e54a071338e99292a5aa2f42c92bc115b4008
Reviewed-on: https://skia-review.googlesource.com/32760
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/src/shaders/SkComposeShader.cpp b/src/shaders/SkComposeShader.cpp
index 7b37140..9799a1c 100644
--- a/src/shaders/SkComposeShader.cpp
+++ b/src/shaders/SkComposeShader.cpp
@@ -125,7 +125,8 @@
 
 /////////////////////////////////////////////////////////////////////
 
-sk_sp<GrFragmentProcessor> SkComposeShader::asFragmentProcessor(const AsFPArgs& args) const {
+std::unique_ptr<GrFragmentProcessor> SkComposeShader::asFragmentProcessor(
+        const AsFPArgs& args) const {
     if (this->isJustMode()) {
         SkASSERT(fMode != SkBlendMode::kSrc && fMode != SkBlendMode::kDst); // caught in factory
         if (fMode == SkBlendMode::kClear) {
@@ -134,11 +135,11 @@
         }
     }
 
-    sk_sp<GrFragmentProcessor> fpA(as_SB(fDst)->asFragmentProcessor(args));
+    std::unique_ptr<GrFragmentProcessor> fpA(as_SB(fDst)->asFragmentProcessor(args));
     if (!fpA) {
         return nullptr;
     }
-    sk_sp<GrFragmentProcessor> fpB(as_SB(fSrc)->asFragmentProcessor(args));
+    std::unique_ptr<GrFragmentProcessor> fpB(as_SB(fSrc)->asFragmentProcessor(args));
     if (!fpB) {
         return nullptr;
     }