Convert //extensions/browser/api from scoped_ptr to std::unique_ptr

extensions/browser/api/runtime/runtime_apitest.cc

Index: extensions/browser/api/runtime/runtime_apitest.cc
diff --git a/extensions/browser/api/runtime/runtime_apitest.cc b/extensions/browser/api/runtime/runtime_apitest.cc
index cc7226687a0a01bba5d824f9170f1574395dc858..78f5998cffdfeb6d73146667599f22e28ffcdfc1 100644
--- a/extensions/browser/api/runtime/runtime_apitest.cc
+++ b/extensions/browser/api/runtime/runtime_apitest.cc
@@ -53,7 +53,7 @@ IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ChromeRuntimeOpenOptionsPageError) {
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ChromeRuntimeGetPlatformInfo) {
-  scoped_ptr<base::Value> result(
+  std::unique_ptr<base::Value> result(
       extension_function_test_utils::RunFunctionAndReturnSingleResult(
           new RuntimeGetPlatformInfoFunction(), "[]", browser()));
   ASSERT_TRUE(result.get() != NULL);