Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/web_resource/web_resource_util_unittest.cc

Index: ios/chrome/browser/web_resource/web_resource_util_unittest.cc
diff --git a/ios/chrome/browser/web_resource/web_resource_util_unittest.cc b/ios/chrome/browser/web_resource/web_resource_util_unittest.cc
index b01f6d94bb6b03516495bfb4ce92376c8961ba83..15293a8b1fb8032a161d1116a6743b9a9f4e9b75 100644
--- a/ios/chrome/browser/web_resource/web_resource_util_unittest.cc
+++ b/ios/chrome/browser/web_resource/web_resource_util_unittest.cc
@@ -33,7 +33,7 @@ class WebResourceUtilTest : public testing::Test {
   }
 
   // Called on success.
-  void OnParseSuccess(scoped_ptr<base::Value> value) {
+  void OnParseSuccess(std::unique_ptr<base::Value> value) {
     success_called_ = true;
     value_ = std::move(value);
   }
@@ -56,7 +56,7 @@ class WebResourceUtilTest : public testing::Test {
 
   base::MessageLoop loop_;
   std::string error_;
-  scoped_ptr<base::Value> value_;
+  std::unique_ptr<base::Value> value_;
   bool error_called_;
   bool success_called_;
 };