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Previously, all instant renderers would reload if a search provider changed. With this patch, some of the renderers are redirected to the local NTP in the case that both the old and new search providers are google.<tld>.

BUG=456681
TEST=BrowserInstantControllerTest*, InstantService* unit_tests

Review URL: https://codereview.chromium.org/930853005

Cr-Commit-Position: refs/heads/master@{#317180}