GCC: add noexcept move assignment in history::URLRow

In GCC, build is failing because history::QueryURLResult declares its move
assignment operator as noexcept using default implementation. That requires
its members to provide a move assignment operator that is noexcept too.

But URLRow was missing noexcept declaration in move assignment operator (even
though it was providing noexcept to its move constructor).

Bug: 819294
Change-Id: I726e3cf7a4a50c9206a5d0fba8a561d363483d4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1651726
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: José Dapena Paz <jose.dapena@lge.com>
Cr-Commit-Position: refs/heads/master@{#670973}
2 files changed