Revert of ozone/drm: Only reuse ScanoutBuffers with compatible modifiers

ui/ozone/platform/drm/gpu/mock_scanout_buffer.h

Index: ui/ozone/platform/drm/gpu/mock_scanout_buffer.h
diff --git a/ui/ozone/platform/drm/gpu/mock_scanout_buffer.h b/ui/ozone/platform/drm/gpu/mock_scanout_buffer.h
index 33f5977d776a91a5996910b395c33e3f355cb629..e2e90467a6f9006be8e5aeca05dbdd998cffa1ae 100644
--- a/ui/ozone/platform/drm/gpu/mock_scanout_buffer.h
+++ b/ui/ozone/platform/drm/gpu/mock_scanout_buffer.h
@@ -16,9 +16,7 @@
 class MockScanoutBuffer : public ScanoutBuffer {
  public:
   MockScanoutBuffer(const gfx::Size& size,
-                    uint32_t format = DRM_FORMAT_XRGB8888,
-                    uint64_t modifier = DRM_FORMAT_MOD_NONE,
-                    const scoped_refptr<DrmDevice>& drm = nullptr);
+                    uint32_t format = DRM_FORMAT_XRGB8888);
 
   // ScanoutBuffer:
   uint32_t GetFramebufferId() const override;
@@ -27,7 +25,6 @@
   gfx::Size GetSize() const override;
   uint32_t GetFramebufferPixelFormat() const override;
   uint32_t GetOpaqueFramebufferPixelFormat() const override;
-  uint64_t GetFormatModifier() const override;
   const DrmDevice* GetDrmDevice() const override;
   bool RequiresGlFinish() const override;
 
@@ -36,9 +33,6 @@
 
   gfx::Size size_;
   uint32_t format_;
-  uint64_t modifier_;
-  uint32_t id_;
-  scoped_refptr<DrmDevice> drm_;
 
   DISALLOW_COPY_AND_ASSIGN(MockScanoutBuffer);
 };