Bazel client: remove StartupFlag class hierarchy

It's simpler and faster to use strings.

PiperOrigin-RevId: 262122410
diff --git a/src/test/cpp/bazel_startup_options_test.cc b/src/test/cpp/bazel_startup_options_test.cc
index 09879e6..2a07b80 100644
--- a/src/test/cpp/bazel_startup_options_test.cc
+++ b/src/test/cpp/bazel_startup_options_test.cc
@@ -16,6 +16,8 @@
 
 #include <stdlib.h>
 
+#include <memory>
+
 #include "src/main/cpp/blaze_util_platform.h"
 #include "src/main/cpp/workspace_layout.h"
 #include "src/test/cpp/test_util.h"
diff --git a/src/test/cpp/option_processor_test.cc b/src/test/cpp/option_processor_test.cc
index e9f09cb..504ea1c 100644
--- a/src/test/cpp/option_processor_test.cc
+++ b/src/test/cpp/option_processor_test.cc
@@ -14,6 +14,8 @@
 
 #include "src/main/cpp/option_processor.h"
 
+#include <memory>
+
 #include "src/main/cpp/bazel_startup_options.h"
 #include "src/main/cpp/blaze_util.h"
 #include "src/main/cpp/blaze_util_platform.h"
diff --git a/src/test/cpp/rc_file_test.cc b/src/test/cpp/rc_file_test.cc
index bfbdbea..6751768 100644
--- a/src/test/cpp/rc_file_test.cc
+++ b/src/test/cpp/rc_file_test.cc
@@ -12,13 +12,15 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "src/main/cpp/option_processor.h"
+#include "src/main/cpp/rc_file.h"
+
+#include <memory>
 
 #include "src/main/cpp/bazel_startup_options.h"
 #include "src/main/cpp/blaze_util.h"
 #include "src/main/cpp/blaze_util_platform.h"
 #include "src/main/cpp/option_processor-internal.h"
-#include "src/main/cpp/rc_file.h"
+#include "src/main/cpp/option_processor.h"
 #include "src/main/cpp/util/file.h"
 #include "src/main/cpp/util/file_platform.h"
 #include "src/main/cpp/util/path.h"
diff --git a/src/test/cpp/startup_options_test.cc b/src/test/cpp/startup_options_test.cc
index 0c2cf2b..3cbd19b 100644
--- a/src/test/cpp/startup_options_test.cc
+++ b/src/test/cpp/startup_options_test.cc
@@ -16,6 +16,8 @@
 
 #include <stdlib.h>
 
+#include <memory>
+
 #include "src/main/cpp/blaze_util_platform.h"
 #include "src/main/cpp/workspace_layout.h"
 #include "src/test/cpp/test_util.h"