Code health: port away from deprecated DictionaryValue::HasKey in /re…

…moting/host

This is a portion for /remoting/host.
(And in some cases also adjust away from other deprecated Value APIs,
 when convenient/nearby)

This CL was uploaded by git cl split.

R=garykac@chromium.org

Bug: 1187060
Change-Id: I6eed0fe716a262d5e9b58f64d6ca73bf5f5a205b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3366701
Auto-Submit: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Gary Kacmarcik <garykac@chromium.org>
Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
Cr-Commit-Position: refs/heads/main@{#955909}

remoting/host/setup/me2me_native_messaging_host_unittest.cc

@@ -214,7 +214,7 @@ void MockDaemonControllerDelegate::SetConfigAndStart(
     bool consent,
     DaemonController::CompletionCallback done) {
   // Verify parameters passed in.
-  if (consent && config && config->HasKey("start")) {
+  if (consent && config && config->FindKey("start")) {
     std::move(done).Run(DaemonController::RESULT_OK);
   } else {
     std::move(done).Run(DaemonController::RESULT_FAILED);
@@ -224,7 +224,7 @@ void MockDaemonControllerDelegate::SetConfigAndStart(
 void MockDaemonControllerDelegate::UpdateConfig(
     std::unique_ptr<base::DictionaryValue> config,
     DaemonController::CompletionCallback done) {
-  if (config && config->HasKey("update")) {
+  if (config && config->FindKey("update")) {
     std::move(done).Run(DaemonController::RESULT_OK);
   } else {
     std::move(done).Run(DaemonController::RESULT_FAILED);