Make ExceptionState parameter of ContainerNode::querySelector() as an optional parameter
This patch makes |ExceptionState| parameter of |ContainerNode::querySelector()| as an optional parameter to reduce source code size for improving code readability and ease of writing tests, since there are lots of call of |querySelector()| with |ASSERT_NO_EXCEPTION| in Blink unit tests. BUG=n/a TEST=n/a; no behavior changes Review-Url: https://codereview.chromium.org/2178243002 Cr-Commit-Position: refs/heads/master@{#407723}
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