FIxed AIDE UI

- Skip button aligned to Next button.
- Added Optional to step message.

BUG=487353

Review URL: https://codereview.chromium.org/1131073004

Cr-Commit-Position: refs/heads/master@{#329833}

chrome/app/chromeos_strings.grdp

@@ -6081,7 +6081,7 @@ All users must sign out to continue.
     Learn more about Enterprise Enrollment
   </message>
   <message name="IDS_ENTERPRISE_ENROLLMENT_ATTRIBUTE_EXPLANATION" desc="Device attribute message to be shown on attribute update prompt screen.">
-    Enter new or update existing information to be associated with this device. 
+    Optional — enter new or update existing information to be associated with this device.
   </message>
   <message name="IDS_ENTERPRISE_ENROLLMENT_EXPLAIN_ATTRIBUTE_LINK" desc="Text on the link to the device attribute update help article.">
     Learn more.

chrome/browser/resources/chromeos/login/oobe_screen_oauth_enrollment_webview.css

@@ -183,3 +183,6 @@ html[dir=rtl] #oauth-enroll-back-button {
   color: black;
 }
 
+#oauth-enroll-skip-button {
+  min-width: 0;
+}

chrome/browser/resources/chromeos/login/oobe_screen_oauth_enrollment_webview.html

@@ -42,13 +42,11 @@
                           type="text"
                           i18n-values="label:oauthEnrollLocationLabel">
               </gaia-input>
-            </gaia-input-form>
-          </div>
-          <div horizontal layout justified>
-            <a href="#" id="oauth-enroll-skip-button"
-                        class="oauth-enroll-link"
+              <gaia-paper-button noink id="oauth-enroll-skip-button"
+                                       class="link-button"
                                        i18n-content="oauthEnrollSkip">
-            </a>
+              </gaia-paper-button>
+            </gaia-input-form>
           </div>
         </div>
       </gaia-card>