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*) If the backup default search provider was deleted from the keywords, it is taken from the prepopulated data array.
*) If a search provider with same URLs already exists, it is updated; otherwise, the prepopulated SP is added.

BUG=105423
TEST=TemplateURLServiceTest.*; For Protector: manual with sqlite3

Review URL: http://codereview.chromium.org/8704007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112661 0039d316-1c4b-4281-b951-d872f2087c98