Remove std::sstream from filamat (#1176)

libs/utils/src/sstream.cpp

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <utils/sstream.h>
+
+namespace utils {
+namespace io {
+
+utils::io::ostream& sstream::flush() noexcept {
+    // no-op.
+    return *this;
+}
+
+const char* sstream::c_str() const noexcept {
+    return mData.get();
+}
+
+} // namespace io
+} // namespace utils