GCC: in perf result reporter, fix kInvalidCharacters initialization.

GCC fails to resolve NoDestructor of an initializer list for initializing
kInvalidCharacters. But if we use also initializer list for NoDestructor
it will work.

Bug: 819294
Change-Id: I22d80b8a8c345287152f6f033ef0d9e2f1ea9734
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2310413Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: José Dapena Paz <jdapena@igalia.com>
Cr-Commit-Position: refs/heads/master@{#790890}

testing/perf/perf_result_reporter.cc

@@ -11,8 +11,8 @@
 namespace {
 
 // These characters mess with either the stdout parsing or the dashboard itself.
-static const base::NoDestructor<std::vector<std::string>> kInvalidCharacters(
-    {"/", ":", "="});
+static const base::NoDestructor<std::vector<std::string>> kInvalidCharacters{
+    {"/", ":", "="}};
 
 void CheckForInvalidCharacters(const std::string& str) {
   for (const auto& invalid : *kInvalidCharacters) {