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This moves AwSwitches to org.chromium.android_webview.common so flags
can be used outside the browser process. This was broken off from
crrev.com/c/2002897 to keep the change history correct.

Test: ninja -C out/aw system_webview_apk
Bug: 1035235
Change-Id: I283273ad70d6b9b71efefc9c198be3f796e8c8f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003031
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732978}