Remove added transformers in QuoteTransformer.

Commit e3606964e69789e5c58b8670027b2a3feef11a99 added some transformers
which it failed to remove. This resulted in many duplicates in the
tokenTransforms array during a test run.

Noticed in bug 52046.

Change-Id: If47c890a1a7a8211c3e918fa36f9ab2659fe12f6