Set v8_enable_sandbox=false by default.

PDFium is currently not compatible with the V8 Sandbox.

Bug: v8:13014
Change-Id: Ib1eeff9e1c45af28c291e305a2ed6ae38cd5044d
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/94891
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/.gn b/.gn
index 748fd93..4821d63 100644
--- a/.gn
+++ b/.gn
@@ -14,6 +14,10 @@
 
   # Turns on compiler optimizations in V8 in Debug build.
   v8_optimized_debug = true
+
+  # PDFium is currently incompatible with the V8 Sandbox.
+  # See https://crbug.com/v8/13014 for details.
+  v8_enable_sandbox = false
 }
 
 no_check_targets = [