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The WTF_PRETTY_FUNCTION takes the name of the class using the typename
given by the compiler. This gives the base class name for all
sub-classes. To make the dump name unique the, gcInfoIndex is appended
to the object name.

BUG=521490

Review URL: https://codereview.chromium.org/1303693005

git-svn-id: svn://svn.chromium.org/blink/trunk@200975 bbb929c8-8fbe-4397-9dbb-9b2b20218538