clang/win: Fix -Wunused-private-field warnings in debug builds.

No intended behavior change.

BUG=505317
Change-Id: I5dfa1d67715b18133f3373ca00a6d1d96b678043
Reviewed-on: https://chromium-review.googlesource.com/284850
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Nico Weber <thakis@chromium.org>
diff --git a/src/libANGLE/renderer/d3d/FramebufferD3D.cpp b/src/libANGLE/renderer/d3d/FramebufferD3D.cpp
index 6adb1fa..746116e 100644
--- a/src/libANGLE/renderer/d3d/FramebufferD3D.cpp
+++ b/src/libANGLE/renderer/d3d/FramebufferD3D.cpp
@@ -84,13 +84,11 @@
 
 }
 
-FramebufferD3D::FramebufferD3D(const gl::Framebuffer::Data &data, RendererD3D *renderer)
+FramebufferD3D::FramebufferD3D(const gl::Framebuffer::Data &data)
     : FramebufferImpl(data),
       mColorAttachmentsForRender(mData.getColorAttachments().size(), nullptr),
-      mInvalidateColorAttachmentCache(true),
-      mRenderer(renderer)
+      mInvalidateColorAttachmentCache(true)
 {
-    ASSERT(mRenderer != nullptr);
 }
 
 FramebufferD3D::~FramebufferD3D()