clang-format: [JS] reserved words in method names.

Summary:
Before:
    class X {
      delete () {
        ...
      }
    }

After:
    class X {
      delete() {
        ...
      }
    }

Reviewers: djasper

Subscribers: cfe-commits, klimek

Differential Revision: https://reviews.llvm.org/D24804

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@282138 91177308-0d34-0410-b5e6-96231b3b80d8