If the client initiates disconnection, set host to NULL to avoid tryi…

…ng to shut it down.

BUG=96647
TEST=Manual

Review URL: http://codereview.chromium.org/7918006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@101552 0039d316-1c4b-4281-b951-d872f2087c98

remoting/host/disconnect_window_mac.mm

@@ -71,6 +71,11 @@ @implementation DisconnectWindowController
 @synthesize disconnectWindow = disconnectWindow_;
 @synthesize username = username_;
 
+- (void)close {
+  self.host = NULL;
+  [super close];
+}
+
 - (id)initWithHost:(remoting::ChromotingHost*)host
             window:(remoting::DisconnectWindowMac*)disconnectWindow
           username:(NSString*)username {