Fixed some stylistic issues with <viewer-password-screen>

elements/viewer-password-screen/viewer-password-screen.html

Index: elements/viewer-password-screen/viewer-password-screen.html
diff --git a/elements/viewer-password-screen/viewer-password-screen.html b/elements/viewer-password-screen/viewer-password-screen.html
index 45c94819a63dddce9f9e063b5050416db4e3c552..fa64893d747727ed8f88080e12136ee97d981e0d 100644
--- a/elements/viewer-password-screen/viewer-password-screen.html
+++ b/elements/viewer-password-screen/viewer-password-screen.html
@@ -16,9 +16,6 @@
     active: false,
     timerId: undefined,
     ready: function () {
-      // Prevent default form submit behavior from occuring.
-      this.$.submit.click = null;
-
       this.activeChanged();
     },
     accept: function() {
@@ -35,15 +32,16 @@
       this.$.password.select();
     },
     submit: function(e) {
+      // Prevent the default form submission behavior.
       e.preventDefault();
       if (this.$.password.value.length == 0)
-        return false;
+        return;
       this.successMessage = '...';
       this.$.successMessage.style.color = 'rgb(0,0,0)';
       this.$.password.disabled = true;
       this.$.submit.disabled = true;
-      this.fire('password-submitted', { password: this.$.password.value });
-      return false;
+      this.fire('password-submitted', {password: this.$.password.value});
+      return;
     },
     activeChanged: function() {
       clearTimeout(this.timerId);