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Revert of DevTools: Made id unique across different remote browsers (patchset #2 id:20001 of https://codereview.chromium.org/560523004/)

Reason for revert:
Need to delete the contents of chrome_beta_pages; see memory leak at https://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20(3)/builds/7887

Original issue's description:
> DevTools: Made id unique across different remote browsers
>
> BUG=338303
>
> Committed: https://crrev.com/7732fd3f76fc31a95f14199f898804e5d80e96e3
> Cr-Commit-Position: refs/heads/master@{#296188}

TBR=dgozman@chromium.org,pfeldman@chromium.org,vkuzkokov@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=338303

Review URL: https://codereview.chromium.org/598663002

Cr-Commit-Position: refs/heads/master@{#296235}