Use std::unique_ptr.

tests/ClearTest.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 
 #if SK_SUPPORT_GPU
@@ skipping 44 matching lines @@
     desc.fConfig = kRGBA_8888_GrPixelConfig;
     desc.fFlags = kRenderTarget_GrSurfaceFlag;
 
     rtKeepAlive->reset(context->textureProvider()->createTexture(desc, SkBudgeted::kYes));
     if (!(*rtKeepAlive)) {
         return false;
     }
     GrRenderTarget* rt = (*rtKeepAlive)->asRenderTarget();
     SkASSERT(rt->getUniqueID() != oldID);
     dc->reset(context->drawContext(rt));
-    return SkToBool(*dc);
+    return *dc != nullptr;
 }
 
 DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ClearBatch, reporter, context) {
     static const int kW = 10;
     static const int kH = 10;
 
     SkIRect fullRect = SkIRect::MakeWH(kW, kH);
     SkAutoTUnref<GrDrawContext> drawContext;
     SkAutoTUnref<GrSurface> rtKeepAlive;
 
@@ skipping 151 matching lines @@
     }
     if (!check_rect(drawContext, outerLeftEdge, kColor1, &actualValue, &failX, &failY) ||
         !check_rect(drawContext, outerTopEdge, kColor1, &actualValue, &failX, &failY) ||
         !check_rect(drawContext, outerRightEdge, kColor1, &actualValue, &failX, &failY) ||
         !check_rect(drawContext, outerBottomEdge, kColor1, &actualValue, &failX, &failY)) {
         ERRORF(reporter, "Expected 0x%08x but got 0x%08x at (%d, %d).", kColor1, actualValue,
                failX, failY);
     }
 }
 #endif