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

Source/core/html/TextDocument.h

Index: Source/core/html/TextDocument.h
diff --git a/Source/core/html/TextDocument.h b/Source/core/html/TextDocument.h
index 8ae93657e72278e5223aacce50423566f5d072ca..a36617db0bfb671b49d5941e562e0589d3b054b1 100644
--- a/Source/core/html/TextDocument.h
+++ b/Source/core/html/TextDocument.h
@@ -19,7 +19,7 @@
  * 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 TextDocument_h
@@ -38,7 +38,7 @@ public:
 
 private:
     TextDocument(const DocumentInit&);
-    
+
     virtual PassRefPtr<DocumentParser> createParser();
 };