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ExtenionUserScriptLoader was calling
ChromeComponentExtensionResourceManager::IsComponentExtensionResource()
on the extension file task runner. But
ChromeComponentExtensionResourceManager should only be accessed on the
main sequence, because LazyInitData needs BrowserProcessImpl, which must
only be accessed on the main sequence (https://crbug.com/1033644).
Besides, LazyInitData() was racy in the previous setup.

Bug: 1113374
Change-Id: Ie1929a024213141a2ae431221e905c73134da65e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343344
Commit-Queue: Wojciech Dzierżanowski <wdzierzanowski@opera.com>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797942}