MD Settings: make input label and error font size relative.

chrome/browser/resources/settings/settings_vars_css.html

Index: chrome/browser/resources/settings/settings_vars_css.html
diff --git a/chrome/browser/resources/settings/settings_vars_css.html b/chrome/browser/resources/settings/settings_vars_css.html
index c4d1409101c867ec331ccc528204b06bd99fdf29..1fa88f765cc21564c6c15657f9ea0aa01428392b 100644
--- a/chrome/browser/resources/settings/settings_vars_css.html
+++ b/chrome/browser/resources/settings/settings_vars_css.html
@@ -103,8 +103,18 @@
       color: inherit;
       font-size: inherit;
       font-weight: inherit;
+      line-height: inherit;
       vertical-align: baseline;
     };
+    --paper-input-container-label: {
+      font-size: inherit;
+      line-height: inherit;
+    }
+    --paper-input-error: {
+      font-size: 92.31%; /* Should be 12px when 100% is 13px. */
+      line-height: inherit;
+      overflow: visible; /* Half-visible error message is not useful at all. */
+    }
     --paper-input-max-width: 264px;
     --paper-radio-button-ink-size: 40px;
     --paper-radio-button-label-color: inherit;