Move WEBRTC_BUILD_LIBEVENT definition to base/BUILD.gn and base/base.gyp. This use all_dependent_co…

webrtc/base/base.gyp

Index: webrtc/base/base.gyp
diff --git a/webrtc/base/base.gyp b/webrtc/base/base.gyp
index 38508ff29cc61acb3661695263d717d239cf39c8..5279899f83c61b089a34a47b75c111640a67cb57 100644
--- a/webrtc/base/base.gyp
+++ b/webrtc/base/base.gyp
@@ -155,6 +155,10 @@
             'task_queue_libevent.cc',
             'task_queue_posix.cc',
           ],
+          'defines': [ 'WEBRTC_BUILD_LIBEVENT' ],
+          'all_dependent_settings': {
+              'defines': [ 'WEBRTC_BUILD_LIBEVENT' ]

[tommi, 2016/07/14 21:47:45]

indent seems off

+          },
         }, {
           # If not libevent, fall back to the other task queues.
           'conditions': [