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

Source/wtf/text/TextCodecUTF8.h

Index: Source/wtf/text/TextCodecUTF8.h
diff --git a/Source/wtf/text/TextCodecUTF8.h b/Source/wtf/text/TextCodecUTF8.h
index dcceddf4a326f53f8ac64634039c0d8b365ab894..c9bb7cbf6bc5d808e6c4a3d5b46a70cd949405d6 100644
--- a/Source/wtf/text/TextCodecUTF8.h
+++ b/Source/wtf/text/TextCodecUTF8.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 TextCodecUTF8_h
@@ -53,7 +53,7 @@ private:
 
     int m_partialSequenceSize;
     uint8_t m_partialSequence[U8_MAX_LENGTH];
-    
+
 };
 
 } // namespace WTF