Move gtest param interface to the necessary class.

chrome/browser/chromeos/arc/arc_session_manager_unittest.cc

Index: chrome/browser/chromeos/arc/arc_session_manager_unittest.cc
diff --git a/chrome/browser/chromeos/arc/arc_session_manager_unittest.cc b/chrome/browser/chromeos/arc/arc_session_manager_unittest.cc
index 23bfe6d9d8986fd7b9789010d37c3a567f425683..b3ade1674ee9561274175eac31d0256ab8a2e8bd 100644
--- a/chrome/browser/chromeos/arc/arc_session_manager_unittest.cc
+++ b/chrome/browser/chromeos/arc/arc_session_manager_unittest.cc
@@ -112,10 +112,7 @@ class FakeLoginDisplayHost : public chromeos::LoginDisplayHost {
 
 }  // namespace
 
-// Bool parameter is used to implement ArcSessionOobeOptInTest tests for
-// managed/unmanaged users. To prevent ambiguous testing::Test inheritance
-// implement derivation here, in base class.
-class ArcSessionManagerTestBase : public testing::TestWithParam<bool> {
+class ArcSessionManagerTestBase : public testing::Test {
  public:
   ArcSessionManagerTestBase()
       : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP),
@@ -647,7 +644,8 @@ TEST_F(ArcSessionOobeOptInTest, OobeOptInActive) {
 
 class ArcSessionOobeOptInNegotiatorTest
     : public ArcSessionOobeOptInTest,
-      public chromeos::ArcTermsOfServiceScreenActor {
+      public chromeos::ArcTermsOfServiceScreenActor,
+      public testing::WithParamInterface<bool> {
  public:
   ArcSessionOobeOptInNegotiatorTest() = default;