Fix swarming for content_browsertests and browser_tests on PlzNavigate FYI bot.

testing/buildbot/chromium.fyi.json

 {
   "Android Asan Builder Tests (dbg)": {
     "gtest_tests": [
       {
         "args": [
           "--tool=asan"
         ],
         "swarming": {
           "can_use_on_swarming_builders": false
         },
@@ skipping 849 matching lines @@
         "test": "webkit_unit_tests"
       }
     ]
   },
   "Android VR Tests": {},
   "Browser Side Navigation Linux": {
     "gtest_tests": [
       {
         "args": [
           "--enable-browser-side-navigation",
-          "--test-launcher-filter-file=src/testing/buildbot/filters/browser-side-navigation.linux.browser_tests.filter",
+          "--test-launcher-filter-file=../../testing/buildbot/filters/browser-side-navigation.linux.browser_tests.filter",

[scottmg, 2016/09/13 22:35:28]

I guess this'll only work with swarming now? Kinda icky.

[jam, 2016/09/13 23:31:36]

Right. This is how we run content browser tests for site isolation and
plznavigate on linux_chromium_rel_ng already.

           "--test-launcher-retry-limit=6"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "browser_tests"
       },
       {
         "args": [
           "--enable-browser-side-navigation",
-          "--test-launcher-filter-file=src/testing/buildbot/filters/browser-side-navigation.linux.content_browsertests.filter"
+          "--test-launcher-filter-file=../../testing/buildbot/filters/browser-side-navigation.linux.content_browsertests.filter"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "content_browsertests"
       },
       {
         "args": [
           "--enable-browser-side-navigation"
         ],
@@ skipping 11133 matching lines @@
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "views_unittests"
       }
     ]
   }
 }