Reenable UpdateDynamicPKPMaxAge0 test.

net/http/http_security_headers_unittest.cc

Index: net/http/http_security_headers_unittest.cc
diff --git a/net/http/http_security_headers_unittest.cc b/net/http/http_security_headers_unittest.cc
index ce919ff81f39455739be69855779f1f2f5f96bed..bf1bcfbe750539c6ab4d1f5ae9a94b56517c54f0 100644
--- a/net/http/http_security_headers_unittest.cc
+++ b/net/http/http_security_headers_unittest.cc
@@ -572,13 +572,7 @@ TEST_F(HttpSecurityHeadersTest, UpdateDynamicPKPOnly) {
   EXPECT_NE(new_dynamic_domain_state.pkp.spki_hashes.end(), hash);
 }
 
-// Failing on win_chromium_rel. crbug.com/375538
-#if defined(OS_WIN)
-#define MAYBE_UpdateDynamicPKPMaxAge0 DISABLED_UpdateDynamicPKPMaxAge0
-#else
-#define MAYBE_UpdateDynamicPKPMaxAge0 UpdateDynamicPKPMaxAge0
-#endif
-TEST_F(HttpSecurityHeadersTest, MAYBE_UpdateDynamicPKPMaxAge0) {
+TEST_F(HttpSecurityHeadersTest, UpdateDynamicPKPMaxAge0) {
   TransportSecurityState state;
   TransportSecurityState::DomainState static_domain_state;
 
@@ -652,7 +646,6 @@ TEST_F(HttpSecurityHeadersTest, MAYBE_UpdateDynamicPKPMaxAge0) {
       domain, true, new_static_domain_state2.pkp.spki_hashes, &failure_log));
   EXPECT_NE(0UL, failure_log.length());
 }
-#undef MAYBE_UpdateDynamicPKPMaxAge0
 
 // Tests that when a static HSTS and a static HPKP entry are present, adding a
 // dynamic HSTS header does not clobber the static HPKP entry. Further, adding a