[libc++] Remove too-stringent XFAILs for file_clock tests

Those tests actually pass because we don't use anything that's marked
as unavailable.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@356719 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/std/utilities/time/time.clock/time.clock.file/consistency.pass.cpp b/test/std/utilities/time/time.clock/time.clock.file/consistency.pass.cpp
index 2bc53a2..34244a8 100644
--- a/test/std/utilities/time/time.clock/time.clock.file/consistency.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.file/consistency.pass.cpp
@@ -12,8 +12,6 @@
 // violation because Clock::is_steady is defined in both the dylib and this TU.
 // UNSUPPORTED: asan
 
-// XFAIL: dylib-has-no-filesystem
-
 // <chrono>
 
 // file_clock
diff --git a/test/std/utilities/time/time.clock/time.clock.file/file_time.pass.cpp b/test/std/utilities/time/time.clock/time.clock.file/file_time.pass.cpp
index 07c5aa6..61d9238 100644
--- a/test/std/utilities/time/time.clock/time.clock.file/file_time.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.file/file_time.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: dylib-has-no-filesystem
 
 // <chrono>
 
diff --git a/test/std/utilities/time/time.clock/time.clock.file/rep_signed.pass.cpp b/test/std/utilities/time/time.clock/time.clock.file/rep_signed.pass.cpp
index 69d91f5..c87fad2 100644
--- a/test/std/utilities/time/time.clock/time.clock.file/rep_signed.pass.cpp
+++ b/test/std/utilities/time/time.clock/time.clock.file/rep_signed.pass.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
-// XFAIL: dylib-has-no-filesystem
 
 // <chrono>