remove redundant ToArray

[SimonCropp]

No description provided.

[joelverhagen]

These tests are failing:

NuGetGallery.PackageOwnershipManagementServiceFacts+TheRemovePackageOwnerAsyncMethod.RemovingNamespaceOwnerRemovesPackageVerified [FAIL] NuGetGallery.PackageOwnershipManagementServiceFacts+TheRemovePackageOwnerAsyncMethod.MultipleNamespaceOwnersRemovalWorksCorrectly [FAIL]
NuGetGallery.PackageOwnershipManagementServiceFacts+TheRemovePackageOwnerAsyncMethod.RemovingNamespaceOwnerAsOrganizationAdminRemovesPackageVerified [FAIL] NuGetGallery.PackageOwnershipManagementServiceFacts+TheRemovePackageOwnerAsyncMethod.AdminCanRemoveAnyOwner [FAIL]
NuGetGallery.PackageOwnershipManagementServiceFacts+TheRemovePackageOwnerWithMessagesAsyncMethod.RemovingNamespaceOwnerRemovesPackageVerified [FAIL]
NuGetGallery.PackageOwnershipManagementServiceFacts+TheRemovePackageOwnerWithMessagesAsyncMethod.MultipleNamespaceOwnersRemovalWorksCorrectly [FAIL]
NuGetGallery.PackageOwnershipManagementServiceFacts+TheRemovePackageOwnerWithMessagesAsyncMethod.RemovingNamespaceOwnerAsOrganizationAdminRemovesPackageVerified [FAIL] NuGetGallery.PackageOwnershipManagementServiceFacts+TheRemovePackageOwnerWithMessagesAsyncMethod.AdminCanRemoveAnyOwner [FAIL]
NuGetGallery.PackageOwnershipManagementServiceFacts+TheRemovePackageOwnerWithMessagesAsyncMethod.AllowsNamespaceOwnershipToBeSkipped [FAIL]

Sample error:

    System.InvalidOperationException : Collection was modified; enumeration operation may not execute.
      Stack Trace:
           at System.Collections.Generic.HashSet`1.Enumerator.MoveNext()
           at NuGetGallery.PackageOwnershipManagementService.<RemovePackageOwnerImplAsync>d__19.MoveNext()
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
           at NuGetGallery.PackageOwnershipManagementService.<RemovePackageOwnerAsync>d__18.MoveNext()
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
           at NuGetGallery.PackageOwnershipManagementService.<RemovePackageOwnerAsync>d__17.MoveNext()
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
        tests\NuGetGallery.Facts\Services\PackageOwnershipManagementServiceFacts.cs(564,0): at NuGetGallery.PackageOwnershipManagementServiceFacts.TheRemovePackageOwnerAsyncMethod.<RemovePackageOwnerAsync>d__1.MoveNext()
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
        tests\NuGetGallery.Facts\Services\PackageOwnershipManagementServiceFacts.cs(669,0): at NuGetGallery.PackageOwnershipManagementServiceFacts.TheRemovePackageOwnerAsyncMethodFacts.<RemovingNamespaceOwnerRemovesPackageVerified>d__8.MoveNext()
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

[SimonCropp]

test should be fixed