Remove more references to GYP.

BUG=pdfium:559,pdfium:695

Change-Id: I534d8b78ae39946e9b423f29ec3884794b3083fc
Reviewed-on: https://pdfium-review.googlesource.com/4256
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/docs/getting-started.md b/docs/getting-started.md
index 8d218e2..8d46a74 100644
--- a/docs/getting-started.md
+++ b/docs/getting-started.md
@@ -12,8 +12,8 @@
 
 *** note
 You must compile PDFium without both V8 and XFA support for the examples
-here to work. V8 can be compiled out by providing
-`GYP_DEFINES="pdf_enable_v8=0 pdf_enable_xfa=0" build/gyp_pdfium`.
+here to work. V8 can be disabled by setting `pdf_enable_v8 = false` in the
+GN args.
 
 See the [V8 Getting Started][pdfium-v8] guide for how to
 initialize PDFium when V8 is compiled into the binary.