Update pdfium/annots/annotation_highlight_expected.pdf.0.png with actual highlight annotation.

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/2193313004 .
diff --git a/pdfium/annots/annotation_highlight_expected.pdf.0.png b/pdfium/annots/annotation_highlight_expected.pdf.0.png
index cc9a762..d38f9f4 100644
--- a/pdfium/annots/annotation_highlight_expected.pdf.0.png
+++ b/pdfium/annots/annotation_highlight_expected.pdf.0.png
Binary files differ