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Put tests next to the code being tested.

Move tests to components/ without actually removing dependencies with temporary DEPS rules added.
This results in these tests still built as parts of unit_tests, not components_unittests.

Fix TemplateURLServiceTestUtil to simplify the code and reduce chrome dependencies:
- Create KeywordWebDataService instead of depending on WebDataServiceFactory.
- Remove TemplateURLService::SetKeywordSearchTermsForURL() and TestingTemplateURLService.  Instead, TestingTemplateURLServiceClient is responsible to implement SetKeywordSearchTermsForURL().
- Remove content::TestBrowserThreadBundle from test util.  Tests are responsible to set up one.  This enables TemplateURLServiceTestSyncTest to use multiple test util instances.

BUG=387985
TEST=unit_tests

Review URL: https://codereview.chromium.org/513133002

Cr-Commit-Position: refs/heads/master@{#292597}