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During unit tests, or if the default search provider is disabled by
policy, there may not be any default search provider.

Previously, we would attempt to dereference a nullptr in that case, and
would intermittently crash. This CL fixes that by simply clearing the
placeholder text when there is no default search provider.

This is fine - as before Material Refresh there was no placeholder text
at all.

Bug: 852630
Change-Id: Id7933f7972de20a41252f8d4f0f7bb16ce623037
Reviewed-on: https://chromium-review.googlesource.com/1101710Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567709}