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Currently if there are multiple QT flags set through chrome://flags,
only one of them will work
This CL fixes the issue

BUG=1158567

Change-Id: If21f90bf51c6a471534a517cd372f2bea7629e98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2590590Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836956}