Replace QuicString with std::string

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Change-Id: Iac93b506b5ef2afce24aa0ce3e05c3983028eef0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1516729
Reviewed-by: Ryan Hamilton <[email protected]>
Commit-Queue: Victor Vasiliev <[email protected]>
Cr-Commit-Position: refs/heads/master@{#639784}
17 files changed