Revert "Turn on clang_use_chrome_plugins for GYP as well."

This reverts commit f7f659c2c98a4d02e3695266d33f449b7be01af9.

PDFium roll in Chromium fails on linux_chromium_chromeos_ozone_rel_ng.

TBR=dsinclair@chromium.org
BUG=pdfium:469

Review-Url: https://codereview.chromium.org/2092273002
diff --git a/pdfium.gyp b/pdfium.gyp
index 164d657..a84c83d 100644
--- a/pdfium.gyp
+++ b/pdfium.gyp
@@ -7,7 +7,7 @@
     'chromium_code': 1,
 
     'variables': {
-      'clang_use_pdfium_plugins%': 1,
+      'clang_use_pdfium_plugins%': 0,
     },
     'clang_use_pdfium_plugins%': '<(clang_use_pdfium_plugins)',