Use std::unique_ptr.

src/gpu/GrLayerAtlas.cpp

Index: src/gpu/GrLayerAtlas.cpp
diff --git a/src/gpu/GrLayerAtlas.cpp b/src/gpu/GrLayerAtlas.cpp
index df8215a6071661112d666f3012ab15d7e6de79a1..c1f8732b351f8dcf6ef62fa9accc8e864e8e867f 100644
--- a/src/gpu/GrLayerAtlas.cpp
+++ b/src/gpu/GrLayerAtlas.cpp
@@ -12,7 +12,7 @@
 #include "GrTextureProvider.h"
 
 ///////////////////////////////////////////////////////////////////////////////
-GrLayerAtlas::Plot::Plot() 
+GrLayerAtlas::Plot::Plot()
     : fID(-1)
     , fRects(nullptr) {
     fOffset.set(0, 0);
@@ -54,7 +54,7 @@ bool GrLayerAtlas::reattachBackingTexture() {
     SkASSERT(!fTexture);
 
     fTexture.reset(fTexProvider->findAndRefTextureByUniqueKey(get_layer_atlas_key()));
-    return SkToBool(fTexture);
+    return fTexture != nullptr;
 }
 
 void GrLayerAtlas::createBackingTexture() {
@@ -71,7 +71,7 @@ void GrLayerAtlas::createBackingTexture() {
     fTexture->resourcePriv().setUniqueKey(get_layer_atlas_key());
 }
 
-GrLayerAtlas::GrLayerAtlas(GrTextureProvider* texProvider, GrPixelConfig config, 
+GrLayerAtlas::GrLayerAtlas(GrTextureProvider* texProvider, GrPixelConfig config,
                            GrSurfaceFlags flags,
                            const SkISize& backingTextureSize,
                            int numPlotsX, int numPlotsY) {