diff --git a/webrtc/base/criticalsection.cc b/webrtc/base/criticalsection.cc
index 63582ebae8..b15bb82ef4 100644
--- a/webrtc/base/criticalsection.cc
+++ b/webrtc/base/criticalsection.cc
@@ -180,18 +180,6 @@ bool CriticalSection::CurrentThreadIsOwner() const {
 #endif
 }
 
-bool CriticalSection::IsLocked() const {
-#if defined(WEBRTC_WIN)
-  return crit_.LockCount != -1;
-#else
-#if CS_DEBUG_CHECKS
-  return thread_ != 0;
-#else
-  return true;
-#endif
-#endif
-}
-
 CritScope::CritScope(const CriticalSection* cs) : cs_(cs) { cs_->Enter(); }
 CritScope::~CritScope() { cs_->Leave(); }
 
diff --git a/webrtc/base/criticalsection.h b/webrtc/base/criticalsection.h
index 49c97a07ac..b06436f759 100644
--- a/webrtc/base/criticalsection.h
+++ b/webrtc/base/criticalsection.h
@@ -63,8 +63,6 @@ class LOCKABLE CriticalSection {
 
   // Use only for RTC_DCHECKing.
   bool CurrentThreadIsOwner() const;
-  // Use only for RTC_DCHECKing.
-  bool IsLocked() const;
 
  private:
 #if defined(WEBRTC_WIN)
diff --git a/webrtc/base/criticalsection_unittest.cc b/webrtc/base/criticalsection_unittest.cc
index fb38737c9a..42679d987f 100644
--- a/webrtc/base/criticalsection_unittest.cc
+++ b/webrtc/base/criticalsection_unittest.cc
@@ -306,23 +306,6 @@ TEST(CriticalSectionTest, Basic) {
   EXPECT_EQ(0, runner.shared_value());
 }
 
-#if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)
-TEST(CriticalSectionTest, IsLocked) {
-  // Simple single-threaded test of IsLocked.
-  CriticalSection cs;
-  EXPECT_FALSE(cs.IsLocked());
-  cs.Enter();
-  EXPECT_TRUE(cs.IsLocked());
-  cs.Leave();
-  EXPECT_FALSE(cs.IsLocked());
-  if (!cs.TryEnter())
-    FAIL();
-  EXPECT_TRUE(cs.IsLocked());
-  cs.Leave();
-  EXPECT_FALSE(cs.IsLocked());
-}
-#endif
-
 class PerfTestData {
  public:
   PerfTestData(int expected_count, Event* event)