Revert "Add option for eliding property metadata from messages"

This reverts commit ca3674b7d5f76299138ca635fa9c02e01e0fdf76.

While there are savings, it ends up being to easy/common to run into issues with
AppStore validation since the selector usage now appears to be a possible match
for private apis vs. for selectors/properties in the generated code.
diff --git a/objectivec/DevTools/compile_testing_protos.sh b/objectivec/DevTools/compile_testing_protos.sh
index 613c63c..69c32f9 100755
--- a/objectivec/DevTools/compile_testing_protos.sh
+++ b/objectivec/DevTools/compile_testing_protos.sh
@@ -1,6 +1,8 @@
 #!/bin/bash -eu
 # Invoked by the Xcode projects to build the protos needed for the unittests.
 
+readonly OUTPUT_DIR="${PROJECT_DERIVED_FILE_DIR}/protos"
+
 # -----------------------------------------------------------------------------
 # Helper for bailing.
 die() {
@@ -9,27 +11,6 @@
 }
 
 # -----------------------------------------------------------------------------
-# Parameters.
-if (( $# > 1 )); then
-  die "Script takes only one parameter: $#"
-fi
-
-if (( $# == 1 )); then
-  case "$1" in
-    "--elide_message_metadata")
-      readonly ELIDE_MESSAGE_METADATA_OPTION="--objc_opt=elide_message_metadata"
-      readonly OUTPUT_DIR="${PROJECT_DERIVED_FILE_DIR}/elided/protos"
-      ;;
-    *)
-      die "Unknown option: $1"
-      ;;
-  esac
-else
-  readonly ELIDE_MESSAGE_METADATA_OPTION=""
-  readonly OUTPUT_DIR="${PROJECT_DERIVED_FILE_DIR}/normal/protos"
-fi
-
-# -----------------------------------------------------------------------------
 # What to do.
 case "${ACTION}" in
   "")
@@ -176,7 +157,6 @@
     --proto_path=src/google/protobuf/          \
     --proto_path=src                           \
     --experimental_allow_proto3_optional       \
-    ${ELIDE_MESSAGE_METADATA_OPTION}           \
     "$@"
 }