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The wrapper currently removes only one set of the flags for code
coverage partial instrumentation. But there can be situation where
multiple sets of same flags are in compile command and all of these need
to be removed.

Bug: 1137569
Change-Id: I32c48710fd9c0c66d7c218f329efcd222704607e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466976
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816694}