Fix browser_tests compile failure on Linux ChromiumOS bots.

ie.
../../chrome/browser/chromeos/policy/device_local_account_browsertest.cc:2608:8: error: no member named 'mutable_pachttpsurlstrippingenabled' in 'enterprise_management::CloudPolicySettings'
      .mutable_pachttpsurlstrippingenabled()
       ^
TBR=atwilson@chromium.org

Bug: 939699
Change-Id: Ie77b8d2d8304b567c0e5c501915ca8749eb2ca65
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1510629
Reviewed-by: Takashi Sakamoto <tasak@google.com>
Commit-Queue: Takashi Sakamoto <tasak@google.com>
Cr-Commit-Position: refs/heads/master@{#638935}
1 file changed