[FRE] Unify chrome://welcome and chrome://welcome-win10 button styles.

chrome/browser/resources/welcome/welcome.css

Index: chrome/browser/resources/welcome/welcome.css
diff --git a/chrome/browser/resources/welcome/welcome.css b/chrome/browser/resources/welcome/welcome.css
index 2ca056c65150d78abf88aa4e66bfbb2659e1c22d..54556bc4586efb7c538654e437774bcf8e0d63f0 100644
--- a/chrome/browser/resources/welcome/welcome.css
+++ b/chrome/browser/resources/welcome/welcome.css
@@ -179,20 +179,29 @@ body {
 }
 
 .action {
+  -webkit-font-smoothing: antialiased;
   background: var(--google-blue-500);
   border-radius: 2px;
+  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, .1);
   color: white;
   font-size: .8125em;
   font-weight: 500;
   line-height: 2.25rem;
   padding: 0 1.5em;
+  transition: 300ms cubic-bezier(.4, .2, 0, 1);
+  will-change: box-shadow;
+}
+
+.action:hover {
+  background: var(--paper-blue-a400);
+  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, .1), 0 1px 2px rgba(0, 0, 0, .24);
 }
 
 .action:active {
   background: var(--google-blue-500);
 }
 
-.action:focus {
+.action.keyboard-focus {
   background: var(--google-blue-700);
 }