Fix absl references

Author: a-maurice

firestore/integration_test_internal/src/util/integration_test_util.cc

@@ -39,8 +39,8 @@ struct TestFriend {
 #if !defined(__ANDROID__)
     return new FirestoreInternal(
         app, database_id,
-        absl::make_shared<credentials::EmptyAuthCredentialsProvider>(),
-        absl::make_shared<credentials::EmptyAppCheckCredentialsProvider>());
+        std::make_shared<credentials::EmptyAuthCredentialsProvider>(),
+        std::make_shared<credentials::EmptyAppCheckCredentialsProvider>());
 #else
     return new FirestoreInternal(app, database_id);
 #endif  // !defined(__ANDROID__)

firestore/src/main/create_app_check_credentials_provider_desktop.cc

@@ -14,7 +14,8 @@
  * limitations under the License.
  */
 
-#include "absl/memory/memory.h"
+#include <memory>
+
 #include "firestore/src/main/app_check_credentials_provider_desktop.h"
 #include "firestore/src/main/create_credentials_provider.h"
 
@@ -25,7 +26,7 @@ using credentials::AppCheckCredentialsProvider;
 
 std::shared_ptr<AppCheckCredentialsProvider> CreateAppCheckCredentialsProvider(
     App& app) {
-  return absl::make_shared<CppAppCheckCredentialsProvider>(app);
+  return std::make_shared<CppAppCheckCredentialsProvider>(app);
 }
 
 }  // namespace firestore