arc: Don't set num_cores_disabled proto field

ARC container does not use the field and it will soon be removed from
proto definition.

BUG=b:142144019
BUG=b:143175953
TEST=try

Change-Id: Ieabdbace116d9c70c35a031f0aee3fe648bdcd6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874580
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Auto-Submit: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708434}

components/arc/session/arc_container_client_adapter.cc

@@ -98,7 +98,6 @@ class ArcContainerClientAdapter
     request.set_arc_custom_tabs_experiment(params.arc_custom_tabs_experiment);
     request.set_arc_print_spooler_experiment(
         params.arc_print_spooler_experiment);
-    request.set_num_cores_disabled(params.num_cores_disabled);
 
     chromeos::SessionManagerClient::Get()->StartArcMiniContainer(
         request, std::move(callback));

components/arc/session/arc_session_impl_unittest.cc

@@ -731,9 +731,6 @@ TEST_F(ArcSessionImplTest, StartArcMiniContainerWithDensity) {
   EXPECT_EQ(240, chromeos::FakeSessionManagerClient::Get()
                      ->last_start_arc_mini_container_request()
                      .lcd_density());
-  EXPECT_EQ(2u, chromeos::FakeSessionManagerClient::Get()
-                    ->last_start_arc_mini_container_request()
-                    .num_cores_disabled());
 }
 
 TEST_F(ArcSessionImplTest, StartArcMiniContainerWithDensityAsync) {
@@ -754,9 +751,6 @@ TEST_F(ArcSessionImplTest, StartArcMiniContainerWithDensityAsync) {
   EXPECT_EQ(240, chromeos::FakeSessionManagerClient::Get()
                      ->last_start_arc_mini_container_request()
                      .lcd_density());
-  EXPECT_EQ(2u, chromeos::FakeSessionManagerClient::Get()
-                    ->last_start_arc_mini_container_request()
-                    .num_cores_disabled());
 }
 
 TEST_F(ArcSessionImplTest, StartArcMiniContainerWithDensityAsyncReversedOrder) {
@@ -776,9 +770,6 @@ TEST_F(ArcSessionImplTest, StartArcMiniContainerWithDensityAsyncReversedOrder) {
   EXPECT_EQ(240, chromeos::FakeSessionManagerClient::Get()
                      ->last_start_arc_mini_container_request()
                      .lcd_density());
-  EXPECT_EQ(2u, chromeos::FakeSessionManagerClient::Get()
-                    ->last_start_arc_mini_container_request()
-                    .num_cores_disabled());
 }
 
 TEST_F(ArcSessionImplTest, StartArcMiniContainerWithDensityAsyncCpuInfoEarly) {
@@ -798,9 +789,6 @@ TEST_F(ArcSessionImplTest, StartArcMiniContainerWithDensityAsyncCpuInfoEarly) {
   EXPECT_EQ(240, chromeos::FakeSessionManagerClient::Get()
                      ->last_start_arc_mini_container_request()
                      .lcd_density());
-  EXPECT_EQ(2u, chromeos::FakeSessionManagerClient::Get()
-                    ->last_start_arc_mini_container_request()
-                    .num_cores_disabled());
 }
 
 TEST_F(ArcSessionImplTest, StopWhileWaitingForLcdDensity) {