Remove unneeded extern keywords.

TBR=reveman@chromium.org,dgozman@chromium.org,lfg@chromium.org,sdefresne@chromium.org,rockot@chromium.org

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I2b94ac88777958e132dce4772fda9ba12320c560
Reviewed-on: https://chromium-review.googlesource.com/771053
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517467}

CrOS-Libchrome-Original-Commit: b1b32d04ae0807b874160ac95eff7ae5c5135b37
1 file changed
tree: 5974c96d8fdec8e1dc684201521519c385e28e4c
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/