Provide an inline implementation of IsEnabled.

webrtc/system_wrappers/include/field_trial.h

Index: webrtc/system_wrappers/include/field_trial.h
diff --git a/webrtc/system_wrappers/include/field_trial.h b/webrtc/system_wrappers/include/field_trial.h
index d649191563e9697344748266206ad065bfb49c33..b94be2cf115ff1eabfed581fed9ebde45424f26b 100644
--- a/webrtc/system_wrappers/include/field_trial.h
+++ b/webrtc/system_wrappers/include/field_trial.h
@@ -64,7 +64,10 @@ 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