Revert "Disable content_browsertests from android-lollipop-arm-rel."

This reverts commit 38fddca3.

Reason for revert: content_browsertests should be covered on android CQ. We could remove test suites that are covered by M from L so that L does not have capacity issue.

Original change's description:
> Disable content_browsertests from android-lollipop-arm-rel.
>
> Bug: 1131618
> Change-Id: I1cbdfeb79ed0b86afe8351bfd10f642851adfb87
> No-Try: true
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427126
> Commit-Queue: Anjali Doneria <adoneria@google.com>
> Reviewed-by: Haiyang Pan <hypan@google.com>
> Reviewed-by: Erik Staab <estaab@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#809953}

TBR=estaab@chromium.org,martiniss@chromium.org,hypan@google.com,adoneria@google.com

Bug: 1131618, 1133002
Change-Id: I2d56ce960db789cd650cd90f6d00a53ce8e96fec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434676Reviewed-by: Haiyang Pan <hypan@google.com>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#812937}

testing/buildbot/chromium.android.json

@@ -24151,6 +24151,53 @@
         "test": "components_unittests",
         "test_id_prefix": "ninja://components:components_unittests/"
       },
+      {
+        "args": [
+          "--gs-results-bucket=chromium-result-details",
+          "--recover-devices"
+        ],
+        "merge": {
+          "args": [
+            "--bucket",
+            "chromium-result-details",
+            "--test-name",
+            "content_browsertests"
+          ],
+          "script": "//build/android/pylib/results/presentation/test_results_presentation.py"
+        },
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "cipd_packages": [
+            {
+              "cipd_package": "infra/tools/luci/logdog/butler/${platform}",
+              "location": "bin",
+              "revision": "git_revision:ff387eadf445b24c935f1cf7d6ddd279f8a6b04c"
+            }
+          ],
+          "dimension_sets": [
+            {
+              "device_os": "LMY48M",
+              "device_os_type": "userdebug",
+              "device_type": "hammerhead",
+              "os": "Android"
+            }
+          ],
+          "output_links": [
+            {
+              "link": [
+                "https://luci-logdog.appspot.com/v/?s",
+                "=android%2Fswarming%2Flogcats%2F",
+                "${TASK_ID}%2F%2B%2Funified_logcats"
+              ],
+              "name": "shard #${SHARD_INDEX} logcats"
+            }
+          ],
+          "service_account": "chromium-tester@chops-service-accounts.iam.gserviceaccount.com",
+          "shards": 15
+        },
+        "test": "content_browsertests",
+        "test_id_prefix": "ninja://content/test:content_browsertests/"
+      },
       {
         "args": [
           "--gs-results-bucket=chromium-result-details",

testing/buildbot/test_suite_exceptions.pyl

@@ -897,7 +897,6 @@
       'CrWinAsan(dll)', # https://crbug.com/935598
       'android-code-coverage-native', # crbug/1018434
       # http://crbug.com/1060245#c30: due to low utility and capacity.
-      'android-lollipop-arm-rel', # https://crbug.com/1131618
       'android-marshmallow-arm64-rel',
     ],
     'modifications': {