core/platform: Include wtf files using "wtf/foo.h" form.

Source/core/platform/graphics/FloatPolygon.cpp

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 12 matching lines @@
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/platform/graphics/FloatPolygon.h"
 
-#include <wtf/MathExtras.h>
+#include "wtf/MathExtras.h"
 
 namespace WebCore {
 
 static inline float determinant(const FloatSize& a, const FloatSize& b)
 {
     return a.width() * b.height() - a.height() * b.width();
 }
 
 static inline bool areCollinearPoints(const FloatPoint& p0, const FloatPoint& p1, const FloatPoint& p2)
 {
@@ skipping 181 matching lines @@
     float uOtherLine = determinant(thisDelta, vertex1Delta) / denominator;
 
     if (uThisLine < 0 || uOtherLine < 0 || uThisLine > 1 || uOtherLine > 1)
         return false;
 
     point = vertex1() + uThisLine * thisDelta;
     return true;
 }
 
 } // namespace WebCore