Fix trailing whitespace in .cpp, .h, and .idl files

Source/core/html/parser/HTMLConstructionSite.h

Index: Source/core/html/parser/HTMLConstructionSite.h
diff --git a/Source/core/html/parser/HTMLConstructionSite.h b/Source/core/html/parser/HTMLConstructionSite.h
index d24d489e1ebe0e865e55e69cf130c185f1cec119..cae255ca9a0e1144ae3724082d94460d226edadd 100644
--- a/Source/core/html/parser/HTMLConstructionSite.h
+++ b/Source/core/html/parser/HTMLConstructionSite.h
@@ -21,7 +21,7 @@
  * 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 HTMLConstructionSite_h
@@ -196,12 +196,12 @@ private:
     void dispatchDocumentElementAvailableIfNeeded();
 
     Document* m_document;
-    
+
     // This is the root ContainerNode to which the parser attaches all newly
     // constructed nodes. It points to a DocumentFragment when parsing fragments
     // and a Document in all other cases.
     ContainerNode* m_attachmentRoot;
-    
+
     RefPtr<HTMLStackItem> m_head;
     RefPtr<HTMLFormElement> m_form;
     mutable HTMLElementStack m_openElements;