Remove IntSize::area, and rename IntSize::area_safe() to IntSize::area()

Source/platform/geometry/IntSize.h

Index: Source/platform/geometry/IntSize.h
diff --git a/Source/platform/geometry/IntSize.h b/Source/platform/geometry/IntSize.h
index daf51852af23308ac024130a3ff321f323124833..f7caf294a173cd3d81ac813bec6f3095c3ab0c5b 100644
--- a/Source/platform/geometry/IntSize.h
+++ b/Source/platform/geometry/IntSize.h
@@ -98,13 +98,8 @@ public:
             m_height = minimumSize.height();
     }
 
-    int area() const
-    {
-        return m_width * m_height;
-    }
-
     // Return area in a uint64_t to avoid overflow.
-    uint64_t area_safe() const
+    uint64_t area() const
     {
         return static_cast<uint64_t>(width()) * height();
     }