Remove ipc_channel_unittests from Android build.

ipc/BUILD.gn

Index: ipc/BUILD.gn
diff --git a/ipc/BUILD.gn b/ipc/BUILD.gn
index 1dddc13484c2d1b9d3328531e5ce8782fb5bb83b..a86eb7c934dbbf0daefbde7d428a4fa1e667e0a3 100644
--- a/ipc/BUILD.gn
+++ b/ipc/BUILD.gn
@@ -179,6 +179,11 @@ test("ipc_tests") {
     sources -= [ "unix_domain_socket_util_unittest.cc" ]
   }
 
+  if (is_android) {
+    # These multiprocess tests don't work on Android.
+    sources -= [ "ipc_channel_unittest.cc" ]
+  }
+
   # TODO(brettw) hook up Android testing.
   #if (is_android && gtest_target_type == "shared_library") {
   #  deps += "/testing/android/native_test.gyp:native_testNative_code"