add a microphone warning for chrome on http

bigbluebutton-client/locale/en_US/bbbResources.properties

@@ -66,6 +66,7 @@ bbb.micSettings.webrtc.waitingforice = Connecting
 bbb.micSettings.webrtc.transferring = Transferring
 bbb.micSettings.webrtc.endingecho = Joining audio
 bbb.micSettings.webrtc.endedecho = Echo test ended.
+bbb.micPermissions.message.browserhttp = This server is not configured with SSL. As a result, {0} disables sharing of your microphone.
 bbb.micPermissions.firefox.title = Firefox Microphone Permissions
 bbb.micPermissions.firefox.message = Click Allow to give Firefox permission to use your microphone.
 bbb.micPermissions.chrome.title = Chrome Microphone Permissions

bigbluebutton-client/src/org/bigbluebutton/main/views/AudioSelectionWindow.mxml

@@ -35,6 +35,8 @@ with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
 		<![CDATA[
 			import com.asfusion.mate.events.Dispatcher;
 			
+			import mx.controls.Alert;
+			
 			import org.as3commons.logging.api.ILogger;
 			import org.as3commons.logging.api.getClassLogger;
 			import org.bigbluebutton.core.Options;
@@ -78,11 +80,18 @@ with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
 					vboxListen.percentWidth = 100;
 				}
 			}
+			
+			private function browserForcesHTTPS() : Boolean {
+				var result : Boolean = !BrowserCheck.isHttps() && ((BrowserCheck.isChrome() && BrowserCheck.browserMajorVersion >= "60") || (BrowserCheck.isOpera() && BrowserCheck.browserMajorVersion >= "47"));
+				return result;
+			}
 
 			private function onMicClick():void {
 				LOGGER.debug("AudioSelectionWindow - Share Microphone Clicked");
 				var dispatcher:Dispatcher = new Dispatcher();
-				if (BrowserCheck.isPuffin46AndAbove() || (!BrowserCheck.isHttps() && ((BrowserCheck.isChrome() && BrowserCheck.browserMajorVersion >= "60") || (BrowserCheck.isOpera() && BrowserCheck.browserMajorVersion >= "47")))) {
+				if (browserForcesHTTPS()) {
+					Alert.show(ResourceUtil.getInstance().getString("bbb.micPermissions.message.browserhttp", [BrowserCheck.browserName]));
+				} else if (BrowserCheck.isPuffin46AndAbove()) {
 					dispatcher.dispatchEvent(new UseFlashModeCommand());
 				} else {
 					var command:JoinVoiceConferenceCommand = new JoinVoiceConferenceCommand();