Fix trailing whitespace in .cpp, .h, and .idl files (ex. Source/core)

Source/wtf/StackStats.h

Index: Source/wtf/StackStats.h
diff --git a/Source/wtf/StackStats.h b/Source/wtf/StackStats.h
index ce8749c7998a42f4ac9cc6f6f885bb76f5cf4b55..c0c424c4d86de33d3187a74d768c5b96d54e49df 100644
--- a/Source/wtf/StackStats.h
+++ b/Source/wtf/StackStats.h
@@ -20,7 +20,7 @@
  * 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. 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef StackStats_h
@@ -44,7 +44,7 @@
 
 namespace WTF {
 
-#if !ENABLE(STACK_STATS) 
+#if !ENABLE(STACK_STATS)
 
 class StackStats {
 public:
@@ -141,7 +141,7 @@ private:
     friend class LayoutCheckPoint;
 };
 
-#endif // ENABLE(STACK_STATS) 
+#endif // ENABLE(STACK_STATS)
 
 } // namespace WTF