Provide an inline implementation of IsEnabled.

webrtc/system_wrappers/include/field_trial.h

 //
 // Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the LICENSE file in the root of the source
 // tree. An additional intellectual property rights grant can be found
 // in the file PATENTS.  All contributing project authors may
 // be found in the AUTHORS file in the root of the source tree.
 //
 
@@ skipping 46 matching lines @@
 namespace field_trial {
 
 // Returns the group name chosen for the named trial, or the empty string
 // if the trial does not exists.
 //
 // Note: To keep things tidy append all the trial names with WebRTC.
 std::string FindFullName(const std::string& name);
 
 // Convenience method, returns true iff FindFullName(name) return a string that
 // starts with "Enabled".
-bool IsEnabled(const char* name);
+// TODO(tommi): Make sure all implementations support this.
+inline bool IsEnabled(const char* name) {
+  return FindFullName(name).find("Enabled") == 0;
+}
 
 }  // namespace field_trial
 }  // namespace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_FIELD_TRIAL_H_