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These made sense in a pre-JS module world. Now that PDF viewer uses
JS modules, they can simply be defined within the scope of the module
to become truly private, as opposed to only be private from Closure
Compiler's perspective.

Bug: None
Change-Id: If3073e38263890e04e6d6e7937ba68959c396d8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615671
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841257}