Revert "Reland "Disable WebRtcBrowserTest.NegotiateNonCryptoCall on Mac""

This reverts commit 70038d92.

Reason for revert: Flakiness may have been resolved with recent changes on tip of tree. No longer seems to repro on local build.

Original change's description:
> Reland "Disable WebRtcBrowserTest.NegotiateNonCryptoCall on Mac"
> 
> This reverts commit b909c213.
> 
> Reason for revert: Re-Disable the flaky test until a fix is found
> 
> Original change's description:
> > Revert "Disable WebRtcBrowserTest.NegotiateNonCryptoCall on Mac"
> > 
> > This reverts commit cfec3da6.
> > 
> > Reason for revert: Checking if flakiness is still happening on Mac ASAN bot
> > 
> > Original change's description:
> > > Disable WebRtcBrowserTest.NegotiateNonCryptoCall on Mac
> > >
> > > TBR=chfremer@chromium.org
> > >
> > > Bug: 810321
> > > Change-Id: Ia12ba855ab9fb8e66c9d48c8e66cf91f76f72e08
> > > Reviewed-on: https://chromium-review.googlesource.com/908461
> > > Reviewed-by: Olga Sharonova <olka@chromium.org>
> > > Commit-Queue: Olga Sharonova <olka@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#535381}
> > 
> > TBR=olka@chromium.org,chfremer@chromium.org
> > 
> > # Not skipping CQ checks because original CL landed > 1 day ago.
> > 
> > Bug: 810321
> > Change-Id: I6e021bca934428cf9c94a34d4f0e874c25868033
> > Reviewed-on: https://chromium-review.googlesource.com/1010842
> > Commit-Queue: Christian Fremerey <chfremer@chromium.org>
> > Reviewed-by: Christian Fremerey <chfremer@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#550380}
> 
> TBR=olka@chromium.org,chfremer@chromium.org
> 
> # Not skipping CQ checks because original CL landed > 1 day ago.
> 
> Bug: 810321
> Change-Id: I68a7e09599e1511e8b4c547e7932e874689ab224
> Reviewed-on: https://chromium-review.googlesource.com/1013018
> Reviewed-by: Christian Fremerey <chfremer@chromium.org>
> Commit-Queue: Christian Fremerey <chfremer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#550867}

TBR=olka@chromium.org,chfremer@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 810321
Change-Id: Ie796bb3b206c6855d9859d8f18ec008e7ac4892a
Reviewed-on: https://chromium-review.googlesource.com/1024746Reviewed-by: Christian Fremerey <chfremer@chromium.org>
Commit-Queue: Christian Fremerey <chfremer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552957}

content/browser/webrtc/webrtc_browsertest.cc

@@ -177,13 +177,7 @@ IN_PROC_BROWSER_TEST_F(MAYBE_WebRtcBrowserTest,
 
 // This test will modify the SDP offer to use no encryption, which should
 // cause SetLocalDescription to fail.
-// Flaky on MAC: http://crbug/810321.
-#if defined(OS_MACOSX)
-#define MAYBE_NegotiateNonCryptoCall DISABLED_NegotiateNonCryptoCall
-#else
-#define MAYBE_NegotiateNonCryptoCall NegotiateNonCryptoCall
-#endif
-IN_PROC_BROWSER_TEST_F(MAYBE_WebRtcBrowserTest, MAYBE_NegotiateNonCryptoCall) {
+IN_PROC_BROWSER_TEST_F(MAYBE_WebRtcBrowserTest, NegotiateNonCryptoCall) {
   MakeTypicalPeerConnectionCall("negotiateNonCryptoCall();");
 }