Disable Poly1305 NEON code again.

The Poly1305 NEON code became live again with the BoringSSL switch. This
change disables it again in Chromium because of some broken phones.

We should really read /proc/cpuinfo and selectively disable, but this
change is simple and keeps the status-quo for now.

BUG=341598

Review URL: https://codereview.chromium.org/443523002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287630 0039d316-1c4b-4281-b951-d872f2087c98

crypto/openssl_util.cc

@@ -62,6 +62,10 @@ class OpenSSLInitSingleton {
         (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0;
     if (has_neon)
       CRYPTO_set_NEON_capable(1);
+    // In all cases, currently, mark the NEON unit as broken because some
+    // phones can't execute the Poly1305 code correctly. See
+    // https://code.google.com/p/chromium/issues/detail?id=341598
+    CRYPTO_set_NEON_functional(0);
 #endif
   }