Oilpan: avoid disabling GC plugin checks over Node.
Oilpan: avoid disabling GC plugin checks over Node.

With the GC plugin now recognizing GC_PLUGIN_IGNORE() on "operator new"
overrides, move down Node's annotation.

R=haraken
BUG=443854

Review URL: https://codereview.chromium.org/986113004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@191543 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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