Merge to XFA: Cleanup: Mark methods with the override keyword.

core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp

Index: core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
index c07806c994df52cc20e7c070dcb79f3d6e995167..cc6c9e9d568df796814a39fd8ca918ce972301d9 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
@@ -512,7 +512,7 @@ class CPDF_LabCS : public CPDF_ColorSpace {
                           int pixels,
                           int image_width,
                           int image_height,
-                          FX_BOOL bTransMask = FALSE) const;
+                          FX_BOOL bTransMask = FALSE) const override;
 
   FX_FLOAT m_WhitePoint[3];
   FX_FLOAT m_BlackPoint[3];