remove unused code

Author: mpeddada1

google/cloud/storage/client_options.cc

@@ -50,16 +50,6 @@ absl::optional<std::string> GetEmulator() {
   return GetEnv("CLOUD_STORAGE_TESTBENCH_ENDPOINT");
 }
 
-StatusOr<std::shared_ptr<oauth2::Credentials>> StorageDefaultCredentials(
-    Options const& options) {
-  auto emulator = GetEmulator();
-  if (emulator.has_value()) {
-    return StatusOr<std::shared_ptr<oauth2::Credentials>>(
-        oauth2::CreateAnonymousCredentials());
-  }
-  return oauth2::GoogleDefaultCredentials(options);
-}
-
 std::size_t DefaultConnectionPoolSize() {
   std::size_t nthreads = std::thread::hardware_concurrency();
   if (nthreads == 0) {

google/cloud/storage/client_options_test.cc

@@ -21,7 +21,6 @@
 #include "google/cloud/internal/rest_options.h"
 #include "google/cloud/internal/rest_response.h"
 #include "google/cloud/opentelemetry_options.h"
-#include "google/cloud/options.h"
 #include "google/cloud/testing_util/scoped_environment.h"
 #include "google/cloud/testing_util/setenv.h"
 #include "google/cloud/testing_util/status_matchers.h"