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The use of leading slashes causes path validation issues in VFS
implementations like vfs::PseudoDir.

This fixes the issue by discarding the leading slash from the path
component of requested URLs.

Adds a browser test which validates the use of PseudoDir and VfsFile
with ContentDirectoryProvider.

Bug: 1011180
Change-Id: I2b47ad35023be73cc32538f83b166ebaa9b85f9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1848411
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Auto-Submit: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704829}