Remove policy tests using legacy drive sync client

DriveFS is going to be used regardless of its feature flag, and the
legacy drive sync client will be deleted, so clean up code that relies
on the legacy drive sync client.

Bug: 1002339
Change-Id: Iba820095870d8aad1ba92b747af0849b750a150d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798257Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697037}

chrome/browser/policy/policy_browsertest.cc

@@ -2148,24 +2148,8 @@ IN_PROC_BROWSER_TEST_F(PolicyTest, DownloadDirectory) {
 }
 
 #if defined(OS_CHROMEOS)
-class DrivePolicyTest : public PolicyTest,
-                        public testing::WithParamInterface<bool> {
- public:
-  void SetUpCommandLine(base::CommandLine* command_line) override {
-    PolicyTest::SetUpCommandLine(command_line);
-    if (GetParam()) {
-      scoped_feature_list_.InitAndEnableFeature(chromeos::features::kDriveFs);
-    } else {
-      scoped_feature_list_.InitAndDisableFeature(chromeos::features::kDriveFs);
-    }
-  }
-
- private:
-  base::test::ScopedFeatureList scoped_feature_list_;
-};
-
 // Verifies that the download directory can be forced to Google Drive by policy.
-IN_PROC_BROWSER_TEST_P(DrivePolicyTest, DownloadDirectory_Drive) {
+IN_PROC_BROWSER_TEST_F(PolicyTest, DownloadDirectory_Drive) {
   // Override the download directory with the policy.
   {
     PolicyMap policies;
@@ -2198,11 +2182,6 @@ IN_PROC_BROWSER_TEST_P(DrivePolicyTest, DownloadDirectory_Drive) {
                 .DownloadPath()
                 .StripTrailingSeparators());
 }
-
-INSTANTIATE_TEST_SUITE_P(DrivePolicyTestInstance,
-                         DrivePolicyTest,
-                         testing::Bool());
-
 #endif  // !defined(OS_CHROMEOS)
 
 IN_PROC_BROWSER_TEST_F(PolicyTest, ExtensionInstallBlacklistSelective) {