We don't seem to require this, the browser + MUI defaults are working in both modes

Tested Chrome, Safari

web/packages/base/components/utils/theme.ts

@@ -674,26 +674,6 @@ const components: Components = {
         },
     },
 
-    MuiFilledInput: {
-        styleOverrides: {
-            input: {
-                // Set the background color for text fields when they get
-                // autofilled by the user agent.
-                //
-                // TODO(LM): Right now we need to set it until the light mode is
-                // fully independent. Post that, see if we really need to
-                // override the user agent defaults. Also note that MUI does
-                // overwrite the UA defaults, so we might need to too.
-                //
-                // https://github.com/search?q=repo%3Amui%2Fmaterial-ui%20path%3A%2F%5Epackages%5C%2Fmui-material%5C%2Fsrc%5C%2F%2F%20WebkitBoxShadow&type=code
-                "&:autofill": {
-                    boxShadow: "0 0 0 100px #266798 inset",
-                    WebkitTextFillColor: "var(--mui-palette-fixed-white)",
-                },
-            },
-        },
-    },
-
     MuiTextField: {
         defaultProps: {
             // The MUI default variant is "outlined", override it to use the