Bug 1388240 - update the DXGITextureHostD3D11::Lock() comment for non-compositor use case. r=nical

MozReview-Commit-ID: ERo8DHpau6c

gfx/layers/d3d11/TextureD3D11.cpp

@@ -873,9 +873,9 @@ bool
 DXGITextureHostD3D11::Lock()
 {
   if (!mProvider) {
-    // Make an early return here if we call SetCompositor() with an incompatible
-    // compositor. This check tries to prevent the problem where we use that
-    // incompatible compositor to compose this texture.
+    // Make an early return here if we call SetTextureSourceProvider() with an
+    // incompatible compositor. This check tries to prevent the problem where we
+    // use that incompatible compositor to compose this texture.
     return false;
   }
 
@@ -886,8 +886,8 @@ bool
 DXGITextureHostD3D11::LockWithoutCompositor()
 {
   // Unlike the normal Lock() function, this function may be called when
-  // mCompositor is nullptr such as during WebVR frame submission. So, there is
-  // no 'mCompositor' checking here.
+  // mProvider is nullptr such as during WebVR frame submission. So, there is
+  // no 'mProvider' checking here.
   if (!mDevice) {
     mDevice = DeviceManagerDx::Get()->GetCompositorDevice();
   }