[embedder-tracing] Fix usage of std::isinf

Introduced in https://chromium-review.googlesource.com/1183431.
The namespace was missing making compilation of Node.js with GCC fail.

Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I55c1117ab347db17fd8acfa92c653e8cf737586f
Reviewed-on: https://chromium-review.googlesource.com/1188126Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Michaël Zasso <mic.besace@gmail.com>
Cr-Commit-Position: refs/heads/master@{#55377}

src/api.cc

@@ -10471,9 +10471,9 @@ bool EmbedderHeapTracer::AdvanceTracing(double deadline_in_ms) {
 #pragma clang diagnostic ignored "-Wdeprecated"
 #endif
   return !this->AdvanceTracing(
-      deadline_in_ms,
-      AdvanceTracingActions(isinf(deadline_in_ms) ? FORCE_COMPLETION
-                                                  : DO_NOT_FORCE_COMPLETION));
+      deadline_in_ms, AdvanceTracingActions(std::isinf(deadline_in_ms)
+                                                ? FORCE_COMPLETION
+                                                : DO_NOT_FORCE_COMPLETION));
 #if __clang__
 #pragma clang diagnostic pop
 #endif