Convert components/sync/driver/* to OnPrimaryAccountChanged()

Methods OnPrimaryAccountSet/Cleared are deprecated. So this cl changes
these calls to OnPrimaryAccountChanged().

Bug: 1158855
Change-Id: Ia5fbd1ca486465badad539093f18e5cf98bdccc7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611739
Commit-Queue: Tanmoy Mollik <triploblastic@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841080}

components/sync/driver/sync_auth_manager.cc

@@ -279,15 +279,18 @@ void SyncAuthManager::ConnectionClosed() {
   connection_open_ = false;
 }
 
-void SyncAuthManager::OnPrimaryAccountSet(
-    const CoreAccountInfo& primary_account_info) {
-  UpdateSyncAccountIfNecessary();
-}
-
-void SyncAuthManager::OnPrimaryAccountCleared(
-    const CoreAccountInfo& previous_primary_account_info) {
-  UMA_HISTOGRAM_ENUMERATION("Sync.StopSource", SIGN_OUT, STOP_SOURCE_LIMIT);
-  UpdateSyncAccountIfNecessary();
+void SyncAuthManager::OnPrimaryAccountChanged(
+    const signin::PrimaryAccountChangeEvent& event) {
+  switch (event.GetEventTypeFor(signin::ConsentLevel::kSync)) {
+    case signin::PrimaryAccountChangeEvent::Type::kCleared:
+      UMA_HISTOGRAM_ENUMERATION("Sync.StopSource", SIGN_OUT, STOP_SOURCE_LIMIT);
+      FALLTHROUGH;
+    case signin::PrimaryAccountChangeEvent::Type::kSet:
+      UpdateSyncAccountIfNecessary();
+      break;
+    case signin::PrimaryAccountChangeEvent::Type::kNone:
+      break;
+  }
 }
 
 void SyncAuthManager::OnRefreshTokenUpdatedForAccount(

components/sync/driver/sync_auth_manager.h

@@ -105,10 +105,8 @@ class SyncAuthManager : public signin::IdentityManager::Observer {
   void ConnectionClosed();
 
   // signin::IdentityManager::Observer implementation.
-  void OnPrimaryAccountSet(
-      const CoreAccountInfo& primary_account_info) override;
-  void OnPrimaryAccountCleared(
-      const CoreAccountInfo& previous_primary_account_info) override;
+  void OnPrimaryAccountChanged(
+      const signin::PrimaryAccountChangeEvent& event) override;
   void OnRefreshTokenUpdatedForAccount(
       const CoreAccountInfo& account_info) override;
   void OnRefreshTokenRemovedForAccount(