Revert "//tools/perf: Remove bad device for android swarming test bot"

This reverts commit 1e2d5ea4.

BUG=705135

Reason: Bot came back online
Review-Url: https://codereview.chromium.org/2831693002
Cr-Commit-Position: refs/heads/master@{#465713}

tools/perf/core/perf_data_generator.py

@@ -189,8 +189,7 @@ def get_fyi_waterfall_config():
        'os': 'Android',
        'android_devices': '1',
        'device_ids': [
-           #'build245-m4--device1', offline, see http://crbug.com/705135
-           'build245-m4--device2',
+           'build245-m4--device1', 'build245-m4--device2',
            'build245-m4--device3', 'build245-m4--device4',
            'build245-m4--device5', 'build245-m4--device6',
            'build245-m4--device7', 'build248-m4--device1',
@@ -761,8 +760,6 @@ def generate_all_tests(waterfall):
   benchmark_sharding_map['5'] = shard_benchmarks(5, all_benchmarks)
   benchmark_sharding_map['1'] = shard_benchmarks(1, all_benchmarks)
   benchmark_sharding_map['21'] = shard_benchmarks(21, all_benchmarks)
-  # Added because of temporary removal of device in http://crbug.com/705135
-  benchmark_sharding_map['20'] = shard_benchmarks(20, all_benchmarks)
 
   for name, config in waterfall['testers'].iteritems():
     use_whitelist = config['use_whitelist']