Revert r113657 "win_release_OmitFramePointers=0 must explicitly pass /Oy-"

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 9f98d20ba0582c7f6b5247baef357139a620a91b..16700085b747ddbab5233b4c8dceffe1273bcbbb 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1493,12 +1493,6 @@
               }],
               ['win_release_OmitFramePointers==0', {
                 'OmitFramePointers': 'false',
-                # The above is not sufficient (http://crbug.com/106711): it
-                # simply eliminates an explicit "/Oy", but both /O2 and /Ox
-                # perform FPO regardless, so we must explicitly disable.
-                # We still want the false setting above to avoid having
-                # "/Oy /Oy-" and warnings about overriding.
-                'AdditionalOptions': ['/Oy-'],
               }],
             ],
           },