Enables media_mojo_unittests on linux bots.

testing/buildbot/chromium.linux.json

Index: testing/buildbot/chromium.linux.json
diff --git a/testing/buildbot/chromium.linux.json b/testing/buildbot/chromium.linux.json
index b3f10a853c785d08860191d8439e64eaa78ecdb2..50c37956a040b6d26391ee21f4d308b50f5d1e47 100644
--- a/testing/buildbot/chromium.linux.json
+++ b/testing/buildbot/chromium.linux.json
@@ -1598,6 +1598,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "media_mojo_unittests"

[ghost stip (do not use), 2016/09/08 19:34:47]

reviewer note: Cast Linux

+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "media_unittests"
       },
       {
@@ -1927,6 +1933,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "media_mojo_unittests"

[ghost stip (do not use), 2016/09/08 19:34:47]

reviewer note: Linux Tests

+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "media_unittests"
       },
       {
@@ -2410,6 +2422,12 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
+        "test": "media_mojo_unittests"

[ghost stip (do not use), 2016/09/08 19:34:47]

reviewer note: Linux Tests (dbg)(1)

+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
         "test": "media_unittests"
       },
       {