diff --git a/test/field_trial.cc b/test/field_trial.cc
index 96842012c6..ae61e0a055 100644
--- a/test/field_trial.cc
+++ b/test/field_trial.cc
@@ -21,7 +21,6 @@
 
 namespace webrtc {
 namespace test {
-void ValidateFieldTrialsStringOrDie(const std::string&) {}
 
 ScopedFieldTrials::ScopedFieldTrials(const std::string& config)
     : previous_field_trials_(webrtc::field_trial::GetFieldTrialString()) {
diff --git a/test/field_trial.h b/test/field_trial.h
index c482ca5aa8..076470e8cc 100644
--- a/test/field_trial.h
+++ b/test/field_trial.h
@@ -16,8 +16,6 @@
 
 namespace webrtc {
 namespace test {
-// TODO(jonasolsson): remove once all internal usages are gone.
-void ValidateFieldTrialsStringOrDie(const std::string&);
 
 // This class is used to override field-trial configs within specific tests.
 // After this class goes out of scope previous field trials will be restored.