Reenabled a flaky test

Reenabling since can't reproduce failure any more.

Bug=pdfium:747

Change-Id: I347a994e0a6b389d39162075f7d5d94ae0048984
Reviewed-on: https://pdfium-review.googlesource.com/6590
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

fpdfsdk/fpdfannot_embeddertest.cpp

diff --git a/fpdfsdk/fpdfannot_embeddertest.cpp b/fpdfsdk/fpdfannot_embeddertest.cpp
index 274ce5b..e1da7cc 100644
--- a/fpdfsdk/fpdfannot_embeddertest.cpp
+++ b/fpdfsdk/fpdfannot_embeddertest.cpp
@@ -146,9 +146,7 @@
   UnloadPage(page);
 }
 
-// TODO(janeliulwq): Re-enable this test once FPDFAnnot_SetColor() stops
-// failing flakily on win_xfa_clang.
-TEST_F(FPDFAnnotEmbeddertest, DISABLED_AddFirstTextAnnotation) {
+TEST_F(FPDFAnnotEmbeddertest, AddFirstTextAnnotation) {
   // Open a file with no annotation and load its first page.
   ASSERT_TRUE(OpenDocument("hello_world.pdf"));
   FPDF_PAGE page = FPDF_LoadPage(document(), 0);