[Autofill] Modernize some AutofillMergeTest

Slightly change the test runner to create one test case per input file (in line with form_structure_browsertest).

As well, change the test cases to work with NAME_FULL and ADDRESS_HOME_STREET_ADDRESS, which reflects the reality and the updated serialize_profiles.py.

BUG=None
TEST=AutofillMergeTest

Review-Url: https://codereview.chromium.org/1932193003
Cr-Commit-Position: refs/heads/master@{#390879}
15 files changed