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For static methods it does not seem to work properly with older gcc.
Indeed the compiler consider the result as not used in this example:

sequence_token_ = BrowserThread::GetBlockingPool()->GetSequenceToken()

"error: ignoring return value of 'static base::SequencedWorkerPool*
content::BrowserThread::GetBlockingPool()', declared with attribute
warn_unused_result [-Werror=unused-result]"

The solution is just to call GetSequenceToken() directly as:
base::SequencedWorkerPool::GetSequenceToken() as it is static.

BUG=579461

R=cpu@chromium.org, nico@chromium.org

TEST= GYP_DEFINES="clang=0 use_sysroot=0"

Review URL: https://codereview.chromium.org/1610103002

Cr-Commit-Position: refs/heads/master@{#371479}