Enable Device Motion API on all platforms by default.

content/child/runtime_features.cc

Index: content/child/runtime_features.cc
diff --git a/content/child/runtime_features.cc b/content/child/runtime_features.cc
index 9d120b92e4d52cc39cdbeb931f3d9635359b87ea..7f610f112dcda07061326bdebbc186090a8f954e 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -108,14 +108,8 @@ void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
   if (command_line.HasSwitch(switches::kEnableWebMIDI))
     WebRuntimeFeatures::enableWebMIDI(true);
 
-#if defined(OS_ANDROID)
-  // Enable Device Motion on Android by default.
-  WebRuntimeFeatures::enableDeviceMotion(
-      !command_line.HasSwitch(switches::kDisableDeviceMotion));
-#else
-  if (command_line.HasSwitch(switches::kEnableDeviceMotion))
-      WebRuntimeFeatures::enableDeviceMotion(true);
-#endif
+  if (command_line.HasSwitch(switches::kDisableDeviceMotion))
+    WebRuntimeFeatures::enableDeviceMotion(false);
 
   if (command_line.HasSwitch(switches::kDisableDeviceOrientation))
     WebRuntimeFeatures::enableDeviceOrientation(false);