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Style fix of TSFTextStoreTest

This CL revises TSFTextStoreTest as follows.
- Initialize variables
- Declare types in anonymous namespace when possible 
- Use DISALLOW_COPY_AND_ASSIGN when appropriate
- Use scoped_refptr when appropriate

There is no behavioral change.

BUG=none
TEST=ran test

Review URL: https://chromiumcodereview.appspot.com/23548030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222249 0039d316-1c4b-4281-b951-d872f2087c98