Add PlzNavigate run of browser_tests to main linux config

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 d385de5d418e4697ae48c5889f34a15d952b9a4d..b1179ee4fe26db421d52f691e4f07af3f815fe70 100644
--- a/testing/buildbot/chromium.linux.json
+++ b/testing/buildbot/chromium.linux.json
@@ -1694,6 +1694,18 @@
         "test": "browser_tests"
       },
       {
+        "args": [
+          "--enable-browser-side-navigation",
+          "--test-launcher-filter-file=../../testing/buildbot/filters/browser-side-navigation.linux.browser_tests.filter"
+        ],
+        "name": "browser_side_navigation_browser_tests",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "shards": 5
+        },
+        "test": "browser_tests"
+      },
+      {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
@@ -2252,6 +2264,18 @@
         "test": "browser_tests"
       },
       {
+        "args": [
+          "--enable-browser-side-navigation",
+          "--test-launcher-filter-file=../../testing/buildbot/filters/browser-side-navigation.linux.browser_tests.filter"
+        ],
+        "name": "browser_side_navigation_browser_tests",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "shards": 10
+        },
+        "test": "browser_tests"
+      },
+      {
         "swarming": {
           "can_use_on_swarming_builders": true
         },