diff --git a/include/dawn/native/DawnNative.h b/include/dawn/native/DawnNative.h
index 39b6fe121e..477c57de29 100644
--- a/include/dawn/native/DawnNative.h
+++ b/include/dawn/native/DawnNative.h
@@ -180,9 +180,6 @@ class DAWN_NATIVE_EXPORT Instance {
     // Enable / disable the adapter blocklist.
     void EnableAdapterBlocklist(bool enable);
 
-    // TODO(dawn:1374) Deprecate this once it is passed via the descriptor.
-    void SetPlatform(dawn::platform::Platform* platform);
-
     uint64_t GetDeviceCountForTesting() const;
 
     // Returns the underlying WGPUInstance object.
diff --git a/src/dawn/native/DawnNative.cpp b/src/dawn/native/DawnNative.cpp
index d5514e25ef..2de16e74f8 100644
--- a/src/dawn/native/DawnNative.cpp
+++ b/src/dawn/native/DawnNative.cpp
@@ -205,11 +205,6 @@ void Instance::EnableAdapterBlocklist(bool enable) {
     mImpl->EnableAdapterBlocklist(enable);
 }
 
-// TODO(dawn:1374) Deprecate this once it is passed via the descriptor.
-void Instance::SetPlatform(dawn::platform::Platform* platform) {
-    mImpl->SetPlatform(platform);
-}
-
 uint64_t Instance::GetDeviceCountForTesting() const {
     return mImpl->GetDeviceCountForTesting();
 }
diff --git a/src/dawn/native/Instance.h b/src/dawn/native/Instance.h
index c943ddee45..b149e6d98d 100644
--- a/src/dawn/native/Instance.h
+++ b/src/dawn/native/Instance.h
@@ -99,9 +99,7 @@ class InstanceBase final : public RefCountedWithExternalCount {
     void EnableAdapterBlocklist(bool enable);
     bool IsAdapterBlocklistEnabled() const;
 
-    // TODO(dawn:1374): SetPlatform should become a private helper, and SetPlatformForTesting
-    // will become the NOT thread-safe testing version exposed for special testing cases.
-    void SetPlatform(dawn::platform::Platform* platform);
+    // Testing only API that is NOT thread-safe.
     void SetPlatformForTesting(dawn::platform::Platform* platform);
     dawn::platform::Platform* GetPlatform();
     BlobCache* GetBlobCache(bool enabled = true);
@@ -131,6 +129,7 @@ class InstanceBase final : public RefCountedWithExternalCount {
     InstanceBase& operator=(const InstanceBase& other) = delete;
 
     MaybeError Initialize(const InstanceDescriptor* descriptor);
+    void SetPlatform(dawn::platform::Platform* platform);
 
     // Lazily creates connections to all backends that have been compiled.
     void EnsureBackendConnection(wgpu::BackendType backendType);