Remove GCC 4 workaround for DEFINE_STATIC_LOCAL
Remove GCC 4 workaround for DEFINE_STATIC_LOCAL

We no longer build with GCC 4 so this special casing can be removed.
After discussing this with Abarth, DEFINE_STATIC_LOCAL does have some
value on its own so I'm leaving that in for now.

R=abarth
BUG=263695

Review URL: https://chromiumcodereview.appspot.com/22266003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@155551 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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