Add cases to switch in ModelTypeToString
Add cases to switch in ModelTypeToString

Some sync integration tests will attempt to get the string for the model type
TOP_LEVEL_FOLDER when the tests are running in very verbose mode (--v=2).
Because there was no case for this type in the switch statement, the tests would
run into a NOTREACHED() assertion.

This change adds the case statement necessary to avoid the NOTREACHED in these
tests.

BUG=98082
TEST=MigrationSingleClientTest.AllTypesWithNigoriIndividually


Review URL: http://codereview.chromium.org/8041036

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@103184 0039d316-1c4b-4281-b951-d872f2087c98

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