Revert "leveldb_snappy_test.cc: REVERT ME: temporarily allow the test to fail on iOS to verify the fix to xcresult_logs.py in #9645"

This reverts commit 73a558c.

Author: dconeybe

Firestore/core/test/unit/local/leveldb_snappy_test.cc

@@ -43,6 +43,12 @@ Path CreateLevelDbDatabaseThatUsesSnappyCompression();
 // This test ensures that we don't accidentally regress having added in Snappy
 // compression support (https://github.com/firebase/firebase-ios-sdk/pull/9596).
 TEST(LevelDbSnappy, LevelDbHasSnappySupportCompiledIn) {
+// Only run this test in cmake builds, since Snappy support is not included
+// when pulling in LevelDb via CocoaPods or Swift Package Manager.
+#if FIRESTORE_TESTS_CMAKE_BUILD
+  GTEST_SKIP() << "Snappy support is only present in cmake builds";
+#endif
+
   Path leveldb_path = CreateLevelDbDatabaseThatUsesSnappyCompression();
   if (HasFatalFailure()) return;