[content shell] Add layout test specific font setup (for linux only right now)

content/shell/webkit_test_platform_support_mac.mm

Index: content/shell/webkit_test_platform_support_mac.mm
diff --git a/remoting/host/installer/mac/uninstaller/remoting_uninstaller.h b/content/shell/webkit_test_platform_support_mac.mm
similarity index 61%
copy from remoting/host/installer/mac/uninstaller/remoting_uninstaller.h
copy to content/shell/webkit_test_platform_support_mac.mm
index 3a3b8ca647f2edb6292ea353677af00fdccefaa6..4fc8307944a480246c5eef839a203a8c041c492c 100644
--- a/remoting/host/installer/mac/uninstaller/remoting_uninstaller.h
+++ b/content/shell/webkit_test_platform_support_mac.mm
@@ -2,11 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#import <Cocoa/Cocoa.h>
+#include "content/shell/webkit_test_platform_support.h"
 
-@interface RemotingUninstaller : NSObject {
+bool WebKitTestPlatformInitialize() {
+  return true;
 }
-
-- (OSStatus)remotingUninstall;
-
-@end