Use Xvfb in isolated testing only if use_x11 is set

content/content_unittests.isolate

Index: content/content_unittests.isolate
diff --git a/content/content_unittests.isolate b/content/content_unittests.isolate
index bc982e2c3dd9239f34ab680f63ffd9ee6528bf8b..4837d6e9b9e1868c5f81e489a532af7bc7a1dd5b 100644
--- a/content/content_unittests.isolate
+++ b/content/content_unittests.isolate
@@ -33,7 +33,7 @@
         ],
       },
     }],
-    ['OS=="linux"', {
+    ['OS=="linux" and use_x11==1', {
       'variables': {
         'command': [
           '../testing/xvfb.py',
@@ -46,28 +46,20 @@
         ],
         'files': [
           '../testing/xvfb.py',
-          '<(PRODUCT_DIR)/libffmpegsumo.so',
-          '<(PRODUCT_DIR)/libosmesa.so',
+          '<(PRODUCT_DIR)/xdisplaycheck<(EXECUTABLE_SUFFIX)',
         ],
       },
     }],
-    ['OS=="linux" and use_ozone==0', {
+    ['OS=="linux"', {
       'variables': {
         'files': [
-          '<(PRODUCT_DIR)/xdisplaycheck<(EXECUTABLE_SUFFIX)',
+          '<(PRODUCT_DIR)/libffmpegsumo.so',
+          '<(PRODUCT_DIR)/libosmesa.so',
         ],
       },
     }],
     ['OS=="mac"', {
       'variables': {
-        'command': [
-          '../testing/test_env.py',
-          '<(PRODUCT_DIR)/content_unittests<(EXECUTABLE_SUFFIX)',
-          '--brave-new-test-launcher',
-          '--test-launcher-bot-mode',
-          '--asan=<(asan)',
-          '--lsan=<(lsan)',
-        ],
         'files': [
           '<(PRODUCT_DIR)/ffmpegsumo.so',
           '<(PRODUCT_DIR)/osmesa.so',
@@ -76,6 +68,14 @@
     }],
     ['OS=="win"', {
       'variables': {
+        'files': [
+          '<(PRODUCT_DIR)/ffmpegsumo.dll',
+          '<(PRODUCT_DIR)/osmesa.dll',
+        ],
+      },
+    }],
+    ['OS=="win" or OS=="mac" or use_ozone==1', {
+      'variables': {
         'command': [
           '../testing/test_env.py',
           '<(PRODUCT_DIR)/content_unittests<(EXECUTABLE_SUFFIX)',
@@ -84,10 +84,6 @@
           '--asan=<(asan)',
           '--lsan=<(lsan)',
         ],
-        'files': [
-          '<(PRODUCT_DIR)/ffmpegsumo.dll',
-          '<(PRODUCT_DIR)/osmesa.dll',
-        ],
       },
     }],
     ['OS=="win" and (fastbuild==0 or fastbuild==1)', {