OSXWindow: ignore deprecated warnings

We can't fix them yet because our continuous testing doesn't compile
with the updated definitions yet.

BUG=angleproject:1598

Change-Id: I40bdeaa6bafbd03b5e3e6c16ac8485e3f488fe59
Reviewed-on: https://chromium-review.googlesource.com/406452
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

util/osx/OSXWindow.mm

@@ -14,6 +14,12 @@
 
 #include "common/debug.h"
 
+// On OSX 10.12 a number of AppKit interfaces have been renamed for consistency, and the previous
+// symbols tagged as deprecated. However we can't simply use the new symbols as it would break
+// compilation on our automated testing that doesn't use OSX 10.12 yet. So we just ignore the
+// warnings.
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
 // Some events such as "ShouldTerminate" are sent to the whole application so we keep a list of
 // all the windows in order to forward the event to each of them. However this and calling pushEvent
 // in ApplicationDelegate is inherently unsafe in a multithreaded environment.