Use std::unique_ptr<base::Value> in V8ValueConverter.

content/child/v8_value_converter_impl.h

Index: content/child/v8_value_converter_impl.h
diff --git a/content/child/v8_value_converter_impl.h b/content/child/v8_value_converter_impl.h
index fd23c47a7e28b358ddac6e52b73646f40c6a6ac1..4b4c00afe4023b424782f71a5074175670765ddc 100644
--- a/content/child/v8_value_converter_impl.h
+++ b/content/child/v8_value_converter_impl.h
@@ -34,8 +34,9 @@ class CONTENT_EXPORT V8ValueConverterImpl : public V8ValueConverter {
   v8::Local<v8::Value> ToV8Value(
       const base::Value* value,
       v8::Local<v8::Context> context) const override;
-  base::Value* FromV8Value(v8::Local<v8::Value> value,
-                           v8::Local<v8::Context> context) const override;
+  std::unique_ptr<base::Value> FromV8Value(
+      v8::Local<v8::Value> value,
+      v8::Local<v8::Context> context) const override;
 
  private:
   friend class ScopedAvoidIdentityHashForTesting;
@@ -57,21 +58,21 @@ class CONTENT_EXPORT V8ValueConverterImpl : public V8ValueConverter {
                                       v8::Local<v8::Object> creation_context,
                                       const base::BinaryValue* value) const;
 
-  base::Value* FromV8ValueImpl(FromV8ValueState* state,
-                               v8::Local<v8::Value> value,
-                               v8::Isolate* isolate) const;
-  base::Value* FromV8Array(v8::Local<v8::Array> array,
-                           FromV8ValueState* state,
-                           v8::Isolate* isolate) const;
+  std::unique_ptr<base::Value> FromV8ValueImpl(FromV8ValueState* state,
+                                               v8::Local<v8::Value> value,
+                                               v8::Isolate* isolate) const;
+  std::unique_ptr<base::Value> FromV8Array(v8::Local<v8::Array> array,
+                                           FromV8ValueState* state,
+                                           v8::Isolate* isolate) const;
 
   // This will convert objects of type ArrayBuffer or any of the
   // ArrayBufferView subclasses.
-  base::Value* FromV8ArrayBuffer(v8::Local<v8::Object> val,
-                                 v8::Isolate* isolate) const;
+  std::unique_ptr<base::Value> FromV8ArrayBuffer(v8::Local<v8::Object> val,
+                                                 v8::Isolate* isolate) const;
 
-  base::Value* FromV8Object(v8::Local<v8::Object> object,
-                            FromV8ValueState* state,
-                            v8::Isolate* isolate) const;
+  std::unique_ptr<base::Value> FromV8Object(v8::Local<v8::Object> object,
+                                            FromV8ValueState* state,
+                                            v8::Isolate* isolate) const;
 
   // If true, we will convert Date JavaScript objects to doubles.
   bool date_allowed_;