Convert //chrome from scoped_ptr to std::unique_ptr

chrome/app/chrome_main_delegate.cc

Index: chrome/app/chrome_main_delegate.cc
diff --git a/chrome/app/chrome_main_delegate.cc b/chrome/app/chrome_main_delegate.cc
index 447923012533b66abfa820199a6c50a91dc66403..c648afc6afc46920765fd7dab3bf10dd4d6b7eb9 100644
--- a/chrome/app/chrome_main_delegate.cc
+++ b/chrome/app/chrome_main_delegate.cc
@@ -364,7 +364,7 @@ void InitializeUserDataDir() {
   // support the virtual desktop use-case.
   if (user_data_dir.empty()) {
     std::string user_data_dir_string;
-    scoped_ptr<base::Environment> environment(base::Environment::Create());
+    std::unique_ptr<base::Environment> environment(base::Environment::Create());
     if (environment->GetVar("CHROME_USER_DATA_DIR", &user_data_dir_string) &&
         base::IsStringUTF8(user_data_dir_string)) {
       user_data_dir = base::FilePath::FromUTF8Unsafe(user_data_dir_string);