Move RTCPeerConnection to correct location to generate the supported check for

tools/dom/templates/html/dart2js/impl_RTCPeerConnection.darttemplate

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-part of $LIBRARYNAME;
-
-$(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
-  factory $CLASSNAME(Map rtcIceServers, [Map mediaConstraints]) {
-    var constructorName = JS('RtcPeerConnection', 'window[#]',
-        '${_browserPropertyPrefix}RTCPeerConnection');
-    if (?mediaConstraints) {
-      return JS('RtcPeerConnection', 'new #(#,#)', constructorName,
-          convertDartToNative_SerializedScriptValue(rtcIceServers),
-          convertDartToNative_SerializedScriptValue(mediaConstraints));
-    } else {
-      return JS('RtcPeerConnection', 'new #(#)', constructorName,
-          convertDartToNative_SerializedScriptValue(rtcIceServers));
-    }
-  }
-
-  /**
-   * Checks if Real Time Communication (RTC) APIs are supported and enabled on 
-   * the current platform.
-   */
-$if DART2JS
-  static bool get supported {
-    // Currently in Firefox some of the RTC elements are defined but throw an
-    // error unless the user has specifically enabled them in their 
-    // about:config. So we have to construct an element to actually test if RTC
-    // is supported at at the given time.
-    try {
-      var c = new RtcPeerConnection({"iceServers": [ {"url":"stun:foo.com"}]});
-      return c is RtcPeerConnection; 
-    } catch (_) {}
-    return false;
-  }
-$else
-  static bool get supported => true;
-$endif
-$!MEMBERS
-}
-
-