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Without jumbo, omnibox takes around 3 CPU minutes to build
which is around 0.5 % of the total build time.

This commit enables jumbo support in components/omnibox.

Bug: 869381
Change-Id: Ifb51dab5a6b034a384c6bf07ee2f5b8c17b952a7
Reviewed-on: https://chromium-review.googlesource.com/1156593Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Oscar Johansson <oscarj@opera.com>
Cr-Commit-Position: refs/heads/master@{#580114}