Stop disabling compiler warning 4481, PDFium edition.
Matches https://crrev.com/366832
R=thakis@chromium.org
Review URL: https://codereview.chromium.org/1546103002 .
diff --git a/build/standalone.gypi b/build/standalone.gypi
index 00bbd4f..7dbbe11 100644
--- a/build/standalone.gypi
+++ b/build/standalone.gypi
@@ -261,7 +261,6 @@
4100, # Unreferenced formal parameter
4121, # Alignment of a member was sensitive to packing
4244, # Conversion from 'type1' to 'type2', possible loss of data
- 4481, # Nonstandard extension used: override specifier 'keyword'
4505, # Unreferenced local function has been removed
4510, # Default constructor could not be generated
4512, # Assignment operator could not be generated
