Replace SmartPointer<T> with unique_ptr<T>

src/ppc/codegen-ppc.cc

Index: src/ppc/codegen-ppc.cc
diff --git a/src/ppc/codegen-ppc.cc b/src/ppc/codegen-ppc.cc
index 8f2f1cd902f4f3a56630b4a00d4c30f7e23757df..07853edc2056c112669a2896fc2c0effb374a7bb 100644
--- a/src/ppc/codegen-ppc.cc
+++ b/src/ppc/codegen-ppc.cc
@@ -6,6 +6,8 @@
 
 #if V8_TARGET_ARCH_PPC
 
+#include <memory>
+
 #include "src/codegen.h"
 #include "src/macro-assembler.h"
 #include "src/ppc/simulator-ppc.h"
@@ -466,7 +468,7 @@ CodeAgingHelper::CodeAgingHelper(Isolate* isolate) {
   // to avoid overloading the stack in stress conditions.
   // DONT_FLUSH is used because the CodeAgingHelper is initialized early in
   // the process, before ARM simulator ICache is setup.
-  base::SmartPointer<CodePatcher> patcher(
+  std::unique_ptr<CodePatcher> patcher(
       new CodePatcher(isolate, young_sequence_.start(),
                       young_sequence_.length() / Assembler::kInstrSize,
                       CodePatcher::DONT_FLUSH));