Revert of Use BoringSSL in the implementation of ClearKey for Chromecast.

chromecast/media/media.gyp

Index: chromecast/media/media.gyp
diff --git a/chromecast/media/media.gyp b/chromecast/media/media.gyp
index 125e278b46c3c09ab58202e4d37994be85caa866..20b1dc0c1347bac2c1dee3df0decdd9eb07dc632 100644
--- a/chromecast/media/media.gyp
+++ b/chromecast/media/media.gyp
@@ -195,7 +195,17 @@
         '../../base/base.gyp:base',
         '../../crypto/crypto.gyp:crypto',
         '../../media/media.gyp:media',
-        '../../third_party/boringssl/boringssl.gyp:boringssl',
+      ],
+      'conditions': [
+        ['chromecast_branding=="Chrome"', {
+          'dependencies': [
+            '../internal/cast_system.gyp:openssl',
+          ],
+        }, {
+          'dependencies': [
+            '../../third_party/boringssl/boringssl.gyp:boringssl',
+          ],
+        }],
       ],
       'sources': [
         'cma/pipeline/audio_pipeline.cc',