gn win: Enable exceptions for pdfium build

build/config/BUILDCONFIG.gn

Index: build/config/BUILDCONFIG.gn
diff --git a/build/config/BUILDCONFIG.gn b/build/config/BUILDCONFIG.gn
index b05247e92ee117c7cfa055aa8d2112d530b5416e..01d59fd46f9a01ec6323d9c9eeca8846e80348ff 100644
--- a/build/config/BUILDCONFIG.gn
+++ b/build/config/BUILDCONFIG.gn
@@ -324,10 +324,17 @@ if (is_win) {
     "//build/config/win:sdk",
     "//build/config/win:unicode",
   ]
+  if (is_component_build) {
+    _native_compiler_configs += [ "//build/config/compiler:exceptions" ]

[Nico, 2014/07/31 23:15:23]

This isn't right, see https://codereview.chromium.org/419973003/ (or that change
is wrong, I suppose)

[scottmg, 2014/07/31 23:24:31]

OK, this is mostly just a port of existing behaviour, so I'm going to let it go
as pdfium can't roll until this lands (because I moved the posix one).

So we don't have any reason to enable exceptions any longer? Or just not based
on shared/static?

+  } else {
+    # We don't use exceptions, and when we link statically we can just get
+    # rid of them entirely.
+    _native_compiler_configs += [ "//build/config/compiler:no_exceptions" ]
+  }
 }
 if (is_posix) {
   _native_compiler_configs += [
-    "//build/config/gcc:no_exceptions",
+    "//build/config/compiler:no_exceptions",
     "//build/config/gcc:symbol_visibility_hidden",
   ]
 }