Make it possible to disable udev in linux

content/content_browser.gypi

Index: content/content_browser.gypi
diff --git a/content/content_browser.gypi b/content/content_browser.gypi
index 1fc3c688523d5facc9631a1491f19083326aca08..069db523b63875f6ebce2b15e73078e333e1e35d 100644
--- a/content/content_browser.gypi
+++ b/content/content_browser.gypi
@@ -1242,7 +1242,7 @@
         '../ui/events/events.gyp:events',
       ],
     }],
-    ['OS!="win" and OS!="mac" and OS!="linux"', {
+    ['OS!="linux" or use_udev==0', {
       'sources': [
         'browser/gamepad/gamepad_platform_data_fetcher.cc',
       ]
@@ -1397,10 +1397,22 @@
     }],
     ['OS=="linux"', {
       'dependencies': [
-        '../build/linux/system.gyp:udev',
         '../sandbox/sandbox.gyp:libc_urandom_override',
       ],
     }],
+    ['use_udev == 1', {
+      'dependencies': [
+        '../build/linux/system.gyp:udev',
+      ],
+    }, {
+      'sources!': [
+        'browser/device_monitor_linux.cc',
+        'browser/device_monitor_linux.h',
+        'browser/gamepad/gamepad_platform_data_fetcher_linux.cc',
+        'browser/udev_linux.cc',
+        'browser/udev_linux.h',
+      ],
+    }],
     ['OS=="linux" and use_aura==1', {
       'dependencies': [
         '../build/linux/system.gyp:dbus',