[MD History] Add UMA stats for switching views and the CBD button.

chrome/browser/resources/md_history/synced_device_manager.html

Index: chrome/browser/resources/md_history/synced_device_manager.html
diff --git a/chrome/browser/resources/md_history/synced_device_manager.html b/chrome/browser/resources/md_history/synced_device_manager.html
index bd8b029e7726883f03ee18a87a3e8126c5d1df2c..5fb1ae4165b756ec97e09672fec8d5788288063a 100644
--- a/chrome/browser/resources/md_history/synced_device_manager.html
+++ b/chrome/browser/resources/md_history/synced_device_manager.html
@@ -72,12 +72,12 @@
       </template>
     </div>
     <div id="no-synced-tabs" class="centered-message"
-        hidden="[[!showNoSyncedMessage(signInState_, syncedDevices_.length,
+        hidden="[[!showNoSyncedMessage(signInState, syncedDevices_.length,
                                        guestSession_)]]">
       [[noSyncedTabsMessage(fetchingSyncedTabs_)]]
     </div>
     <div id="sign-in-guide"
-        hidden="[[!showSignInGuide(signInState_, guestSession_)]]">
+        hidden="[[!showSignInGuide(signInState, guestSession_)]]">
       <div id="illustration"></div>
       <div id="sign-in-promo">$i18n{signInPromo}</div>
       <div id="sign-in-promo-desc">$i18n{signInPromoDesc}</div>