binding: Re-enables blink_perf.bindings on all platforms.

serialize-nested-array.html in blink_perf.bindings was failing
because of too much of nest level in test code, which was
causing stack overflow in V8.  The failure was triggered with
https://crrev.com/2517813002 .

Discussed with the test owner peria@ and reached to a conclusion
that we don't need such a huge nest level for this test.  Thus,
this CL reduces the nest level of the test.

BUG=670069
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.perf:linux_perf_cq;master.tryserver.chromium.perf:mac_retina_perf_cq;master.tryserver.chromium.perf:winx64_10_perf_cq

Review-Url: https://codereview.chromium.org/2553993002
Cr-Commit-Position: refs/heads/master@{#439859}

third_party/WebKit/PerformanceTests/Bindings/serialize-nested-array.html

@@ -3,7 +3,7 @@
 <script src="../resources/runner.js"></script>
 <script>
 
-var length = 10000;
+var length = 1000;
 var obj = [];
 for (var i = 0; i < length; i++)
     obj = [obj];

tools/perf/benchmarks/blink_perf.py

@@ -151,7 +151,6 @@ class _SharedPywebsocketPageState(shared_page_state.SharedPageState):
     self.platform.StartLocalServer(pywebsocket_server.PywebsocketServer())
 
 
-@benchmark.Disabled('all') # http://crbug.com/670069
 class BlinkPerfBindings(_BlinkPerfBenchmark):
   tag = 'bindings'
   subdir = 'Bindings'