Remove another is_nacl test from PDFium build file.

It is nacl nevermore.

Change-Id: Ibebeabc78ca5d81f37618516d6898fe80c94ccc3
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/133590
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Auto-Submit: Tom Sepez <tsepez@chromium.org>

skia/BUILD.gn

diff --git a/skia/BUILD.gn b/skia/BUILD.gn
index 3d89428..2ea7cdd 100644
--- a/skia/BUILD.gn
+++ b/skia/BUILD.gn
@@ -300,7 +300,7 @@
     ]
   }
 
-  if (is_clang && !is_nacl) {
+  if (is_clang) {
     # Skia won't compile with some of the more strict clang warnings.
     # e.g. it does:
     #  SkASSERT(!"sk_out_of_memory");