Rename TaskRunner::RunsTasksOnCurrentThread() in //components

renamed TaskRunner::RunsTasksOnCurrentThread() to
TaskRunner::RunsTasksInCurrentSequence() in //components

BUG=665062

Review-Url: https://codereview.chromium.org/2889683003
Cr-Commit-Position: refs/heads/master@{#482173}
31 files changed