Convert //extensions/{common,shell} from scoped_ptr to std::unique_ptr

extensions/shell/browser/api/identity/identity_api.h

Index: extensions/shell/browser/api/identity/identity_api.h
diff --git a/extensions/shell/browser/api/identity/identity_api.h b/extensions/shell/browser/api/identity/identity_api.h
index a3343aded238bd5a843661fca28c49eed8336cc1..1523aa2d5d1ef6d0840ea0afd01d9817b707eb60 100644
--- a/extensions/shell/browser/api/identity/identity_api.h
+++ b/extensions/shell/browser/api/identity/identity_api.h
@@ -74,10 +74,10 @@ class IdentityGetAuthTokenFunction : public UIThreadExtensionFunction,
  private:
   // A pending token fetch request to get a login-scoped access token for the
   // current user for the Chrome project id.
-  scoped_ptr<OAuth2TokenService::Request> access_token_request_;
+  std::unique_ptr<OAuth2TokenService::Request> access_token_request_;
 
   // A request for an access token for the current app and its scopes.
-  scoped_ptr<OAuth2MintTokenFlow> mint_token_flow_;
+  std::unique_ptr<OAuth2MintTokenFlow> mint_token_flow_;
 
   DISALLOW_COPY_AND_ASSIGN(IdentityGetAuthTokenFunction);
 };