Do not clear password field in authenticator in case emails mismatch.

chrome/browser/resources/gaia_auth_host/authenticator.js

Index: chrome/browser/resources/gaia_auth_host/authenticator.js
diff --git a/chrome/browser/resources/gaia_auth_host/authenticator.js b/chrome/browser/resources/gaia_auth_host/authenticator.js
index 6492781c36c103aac1675b5e131f054451d7a216..cef63cd031c0d4ed8624e50b5122c1c23d556cf0 100644
--- a/chrome/browser/resources/gaia_auth_host/authenticator.js
+++ b/chrome/browser/resources/gaia_auth_host/authenticator.js
@@ -116,6 +116,8 @@ cr.define('cr.login', function() {
     this.webview_.addEventListener(
         'newwindow', this.onNewWindow_.bind(this));
     this.webview_.addEventListener(
+        'contentload', this.onContentLoad_.bind(this));
+    this.webview_.addEventListener(
         'loadstop', this.onLoadStop_.bind(this));
     this.webview_.request.onCompleted.addListener(
         this.onRequestCompleted_.bind(this),
@@ -196,9 +198,6 @@ cr.define('cr.login', function() {
 
     this.updateHistoryState_(currentUrl);
 
-    // Posts a message to IdP pages to initiate communication.
-    if (currentUrl.lastIndexOf(this.idpOrigin_) == 0)
-      this.webview_.contentWindow.postMessage({}, currentUrl);
   };
 
   /**
@@ -254,12 +253,7 @@ cr.define('cr.login', function() {
           signinDetails[pair[0].trim()] = pair[1].trim();
         });
         // Removes "" around.
-        var email = signinDetails['email'].slice(1, -1);
-        if (this.email_ != email) {
-          this.email_ = email;
-          // Clears the scraped password if the email has changed.
-          this.password_ = null;
-        }
+        this.email_ = signinDetails['email'].slice(1, -1);
         this.gaiaId_ = signinDetails['obfuscatedid'].slice(1, -1);
         this.sessionIndex_ = signinDetails['sessionindex'];
       } else if (headerName == SAML_HEADER) {
@@ -318,6 +312,18 @@ cr.define('cr.login', function() {
   };
 
   /**
+   * Invoked when a new document is loaded.
+   * @private
+   */
+  Authenticator.prototype.onContentLoad_ = function(e) {
+    // Posts a message to IdP pages to initiate communication.
+    var currentUrl = this.webview_.src;
+    if (currentUrl.lastIndexOf(this.idpOrigin_) == 0) {
+      this.webview_.contentWindow.postMessage({}, currentUrl);
+    }
+  };
+
+  /**
    * Invoked when the webview finishes loading a page.
    * @private
    */