Un-XFAIL TestNamespaceLookup for linux

These tests are now passing on linux, at least with top-of-tree clang,
clang-6 and gcc-7.3. It's possible it may still be failing with some
older compilers, but I don't have those around to test.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@349478 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/packages/Python/lldbsuite/test/lang/cpp/namespace/TestNamespaceLookup.py b/packages/Python/lldbsuite/test/lang/cpp/namespace/TestNamespaceLookup.py
index 2837cfd..f87dc10 100644
--- a/packages/Python/lldbsuite/test/lang/cpp/namespace/TestNamespaceLookup.py
+++ b/packages/Python/lldbsuite/test/lang/cpp/namespace/TestNamespaceLookup.py
@@ -42,10 +42,7 @@
                              'stop reason = breakpoint'])
 
     @expectedFailureAll(
-        oslist=[
-            "windows",
-            "linux",
-            "freebsd"],
+        oslist=["windows", "freebsd"],
         bugnumber="llvm.org/pr25819")
     def test_scope_lookup_with_run_command(self):
         """Test scope lookup of functions in lldb."""
@@ -230,10 +227,7 @@
         oslist=["linux"],
         debug_info=["dwo"])  # Skip to avoid crash
     @expectedFailureAll(
-        oslist=[
-            "windows",
-            "linux",
-            "freebsd"],
+        oslist=["windows", "freebsd"],
         bugnumber="llvm.org/pr25819")
     def test_scope_after_using_directive_lookup_with_run_command(self):
         """Test scope lookup after using directive in lldb."""
@@ -297,10 +291,7 @@
         self.expect("expr -- func()", startstr="error")
 
     @expectedFailureAll(
-        oslist=[
-            "windows",
-            "linux",
-            "freebsd"],
+        oslist=["windows", "freebsd"],
         bugnumber="llvm.org/pr25819")
     def test_scope_lookup_shadowed_by_using_with_run_command(self):
         """Test scope lookup shadowed by using in lldb."""