Refactor OS_LINUX preprocessor directive for LaCrOS effort.

Currently, ChromeOS defines the OS_LINUX directive as well as
OS_CHROMEOS.  We're working to separate these two, so we're
making the fact that OS_LINUX == OS_LINUX || OS_CHROMEOS
explicit.

Bug: 1110266
Change-Id: Ibf45218c1ba6a609714ba80ee2d7bae28e929f36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352689
Reviewed-by: Yuri Wiitala <[email protected]>
Reviewed-by: Michael Spang <[email protected]>
Reviewed-by: Jonathan Backer <[email protected]>
Reviewed-by: Kentaro Hara <[email protected]>
Reviewed-by: Trent Apted <[email protected]>
Reviewed-by: Ken Rockot <[email protected]>
Commit-Queue: Sean McAllister <[email protected]>
Cr-Commit-Position: refs/heads/master@{#799767}
diff --git a/ipc/ipc_message_utils.cc b/ipc/ipc_message_utils.cc
index 42cb4cce..54d49ec 100644
--- a/ipc/ipc_message_utils.cc
+++ b/ipc/ipc_message_utils.cc
@@ -356,8 +356,8 @@
   l->append(base::NumberToString(p));
 }
 
-#if defined(OS_WIN) || defined(OS_LINUX) || defined(OS_FUCHSIA) || \
-    (defined(OS_ANDROID) && defined(ARCH_CPU_64_BITS))
+#if defined(OS_WIN) || defined(OS_LINUX) || defined(OS_CHROMEOS) || \
+    defined(OS_FUCHSIA) || (defined(OS_ANDROID) && defined(ARCH_CPU_64_BITS))
 void ParamTraits<long>::Log(const param_type& p, std::string* l) {
   l->append(base::NumberToString(p));
 }