Bug 1609489 - Remove lazy_static usage from custom_properties.rs. r=m_kato

Differential Revision: https://phabricator.services.mozilla.com/D60039

--HG--
extra : moz-landing-system : lando

servo/components/style/custom_properties.rs

@@ -62,14 +62,12 @@ fn get_safearea_inset_right(device: &Device) -> VariableValue {
     VariableValue::pixel(device.safe_area_insets().right)
 }
 
-lazy_static! {
-    static ref ENVIRONMENT_VARIABLES: [EnvironmentVariable; 4] = [
+static ENVIRONMENT_VARIABLES: [EnvironmentVariable; 4] = [
     make_variable!(atom!("safe-area-inset-top"), get_safearea_inset_top),
     make_variable!(atom!("safe-area-inset-bottom"), get_safearea_inset_bottom),
     make_variable!(atom!("safe-area-inset-left"), get_safearea_inset_left),
     make_variable!(atom!("safe-area-inset-right"), get_safearea_inset_right),
-    ];
-}
+];
 
 impl CssEnvironment {
     #[inline]