Fold //ipc/mojo into //ipc.

testing/buildbot/chromium.linux.json

 {
   "Android Arm64 Builder (dbg)": {
     "additional_compile_targets": [
       "all"
     ]
   },
   "Android Builder": {
     "additional_compile_targets": [
       "cronet_test_instrumentation_apk",
       "system_webview_apk"
@@ skipping 322 matching lines @@
             {
               "android_devices": "4",
               "device_os": "KTU84P",
               "device_type": "hammerhead"
             }
           ]
         },
         "test": "gpu_unittests"
       },
       {
-        "override_isolate_target": "ipc_mojo_unittests",
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "dimension_sets": [
-            {
-              "android_devices": "4",
-              "device_os": "KTU84P",
-              "device_type": "hammerhead"
-            }
-          ],
-          "hard_timeout": 60
-        },
-        "test": "ipc_mojo_unittests"
-      },
-      {
         "override_isolate_target": "ipc_tests",
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
               "android_devices": "4",
               "device_os": "KTU84P",
               "device_type": "hammerhead"
             }
           ]
@@ skipping 345 matching lines @@
       {
         "test": "gl_unittests"
       },
       {
         "test": "gpu_ipc_service_unittests"
       },
       {
         "test": "gpu_unittests"
       },
       {
-        "test": "ipc_mojo_unittests"
-      },
-      {
         "test": "ipc_tests"
       },
       {
         "test": "media_unittests"
       },
       {
         "test": "mojo_common_unittests"
       },
       {
         "test": "mojo_public_application_unittests"
@@ skipping 468 matching lines @@
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "interactive_ui_tests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
-        "test": "ipc_mojo_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ipc_tests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "jingle_unittests"
       },
       {
         "swarming": {
@@ skipping 462 matching lines @@
         "swarming": {
           "can_use_on_swarming_builders": true,
           "shards": 3
         },
         "test": "interactive_ui_tests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
-        "test": "ipc_mojo_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ipc_tests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "jingle_unittests"
       },
       {
         "swarming": {
@@ skipping 369 matching lines @@
         "swarming": {
           "can_use_on_swarming_builders": true,
           "shards": 3
         },
         "test": "interactive_ui_tests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
-        "test": "ipc_mojo_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "ipc_tests"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "jingle_unittests"
       },
       {
         "swarming": {
@@ skipping 154 matching lines @@
         "override_compile_targets": [
           "telemetry_unittests_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true
         }
       }
     ]
   }
 }