Remove dependence on a message loop for net::PathBuilder.

net/cert/internal/path_builder_verify_certificate_chain_unittest.cc

Index: net/cert/internal/path_builder_verify_certificate_chain_unittest.cc
diff --git a/net/cert/internal/path_builder_verify_certificate_chain_unittest.cc b/net/cert/internal/path_builder_verify_certificate_chain_unittest.cc
index 3bc20ef08190ec9578153263ca15ee06525d036b..003157b8dfad267946cc426d77f4598d308f5464 100644
--- a/net/cert/internal/path_builder_verify_certificate_chain_unittest.cc
+++ b/net/cert/internal/path_builder_verify_certificate_chain_unittest.cc
@@ -37,9 +37,7 @@ class PathBuilderDelegate {
                                  time, &result);
     path_builder.AddCertIssuerSource(&intermediate_cert_issuer_source);
 
-    CompletionStatus rv = path_builder.Run(base::Closure());
-    EXPECT_EQ(CompletionStatus::SYNC, rv);
-
+    path_builder.Run();
     EXPECT_EQ(expected_result, result.HasValidPath());
   }
 };