Convert //content from scoped_ptr to std::unique_ptr

content/test/blink_test_environment.cc

Index: content/test/blink_test_environment.cc
diff --git a/content/test/blink_test_environment.cc b/content/test/blink_test_environment.cc
index 6a39bcdb3a41ff1994d5663dd63d4bd0b7f79b1c..77dee1a8e6c38f7842c9a348ce3e8cf921b5fac9 100644
--- a/content/test/blink_test_environment.cc
+++ b/content/test/blink_test_environment.cc
@@ -82,9 +82,9 @@ class TestEnvironment {
   }
 
  private:
-  scoped_ptr<MessageLoopType> main_message_loop_;
-  scoped_ptr<TestBlinkWebUnitTestSupport> blink_test_support_;
-  scoped_ptr<TestContentClientInitializer> content_initializer_;
+  std::unique_ptr<MessageLoopType> main_message_loop_;
+  std::unique_ptr<TestBlinkWebUnitTestSupport> blink_test_support_;
+  std::unique_ptr<TestContentClientInitializer> content_initializer_;
   base::TestDiscardableMemoryAllocator discardable_memory_allocator_;
 };