Cleanup MIPS specific link configuration

With recent rolls of chromium_revision, we've now rolled past
https://codereview.chromium.org/2048063002 so this workaround
is no longer needed.

BUG=webrtc:5977
NOTRY=True

Review-Url: https://codereview.webrtc.org/2071133003
Cr-Commit-Position: refs/heads/master@{#13207}

webrtc/supplement.gypi

@@ -29,10 +29,6 @@
         # libjingle_peerconnection_so file size.
         'libyuv_disable_jpeg%': 1,
       }],
-      ['OS=="android" and target_arch=="mipsel"', {
-        # Linking fails with the gold linker: bugs.webrtc.org/5977.
-        'linux_use_bundled_gold%': 0,
-      }],
     ],
   },
   'target_defaults': {