Remove WTF_USE_QUERY_PERFORMANCE_COUNTER as it is not used.
Remove WTF_USE_QUERY_PERFORMANCE_COUNTER as it is not used.

Also made some minor editorial (and not functional) changes in Platform.h.

Review URL: https://chromiumcodereview.appspot.com/14159022

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@149169 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs