Sync UI: Don't allow setting a passphrase if !EncryptEverythingAllowed

If EncryptEverythingAllowed() was false, then PeopleHandler already
skipped the call to EnableEncryptEverything(), but it did still call
SetEncryptionPassphrase(). That could get users into a weird state
where Sync stopped working.
This CL fixes the issue by also skipping the SetEncryptionPassphrase()
call in case EncryptEverythingAllowed() is false.

Bug: 924847
Change-Id: I3b606e3ea9d0a8f86b865b41eda233dd472cc1eb
Reviewed-on: https://chromium-review.googlesource.com/c/1439299Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#627004}

chrome/browser/ui/webui/settings/people_handler.cc

@@ -546,8 +546,10 @@ void PeopleHandler::HandleSetEncryption(const base::ListValue* args) {
   // Don't allow "encrypt all" if the SyncService doesn't allow it.
   // The UI is hidden, but the user may have enabled it e.g. by fiddling with
   // the web inspector.
-  if (!service->GetUserSettings()->IsEncryptEverythingAllowed())
+  if (!service->GetUserSettings()->IsEncryptEverythingAllowed()) {
     configuration.encrypt_all = false;
+    configuration.set_new_passphrase = false;
+  }
 
   // Note: Data encryption will not occur until configuration is complete
   // (when the PSS receives its CONFIGURE_DONE notification from the sync

chrome/browser/ui/webui/settings/people_handler_unittest.cc

@@ -731,6 +731,8 @@ TEST_F(PeopleHandlerTest, SetNewCustomPassphrase) {
   base::ListValue list_args;
   list_args.AppendString(kTestCallbackId);
   list_args.AppendString(args);
+  ON_CALL(*mock_pss_->GetUserSettingsMock(), IsEncryptEverythingAllowed())
+      .WillByDefault(Return(true));
   ON_CALL(*mock_pss_->GetUserSettingsMock(),
           IsPassphraseRequiredForDecryption())
       .WillByDefault(Return(false));
@@ -1067,11 +1069,6 @@ TEST_F(PeopleHandlerTest, ShowSetupEncryptAllDisallowed) {
 }
 
 TEST_F(PeopleHandlerTest, TurnOnEncryptAllDisallowed) {
-  std::string args = GetConfiguration(
-      NULL, SYNC_ALL_DATA, GetAllTypes(), std::string(), ENCRYPT_ALL_DATA);
-  base::ListValue list_args;
-  list_args.AppendString(kTestCallbackId);
-  list_args.AppendString(args);
   ON_CALL(*mock_pss_->GetUserSettingsMock(),
           IsPassphraseRequiredForDecryption())
       .WillByDefault(Return(false));
@@ -1080,8 +1077,20 @@ TEST_F(PeopleHandlerTest, TurnOnEncryptAllDisallowed) {
   SetupInitializedProfileSyncService();
   ON_CALL(*mock_pss_->GetUserSettingsMock(), IsEncryptEverythingAllowed())
       .WillByDefault(Return(false));
+
+  base::DictionaryValue dict;
+  dict.SetBoolean("setNewPassphrase", true);
+  std::string args = GetConfiguration(&dict, SYNC_ALL_DATA, GetAllTypes(),
+                                      "password", ENCRYPT_ALL_DATA);
+  base::ListValue list_args;
+  list_args.AppendString(kTestCallbackId);
+  list_args.AppendString(args);
+
   EXPECT_CALL(*mock_pss_->GetUserSettingsMock(), EnableEncryptEverything())
       .Times(0);
+  EXPECT_CALL(*mock_pss_->GetUserSettingsMock(), SetEncryptionPassphrase(_))
+      .Times(0);
+
   handler_->HandleSetEncryption(&list_args);
 
   ExpectPageStatusResponse(PeopleHandler::kConfigurePageStatus);