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.

This is changes for /components/cookie_config

This CL was uploaded by git cl split.

R=blundell@chromium.org

Bug: 1110266
Change-Id: I61908a6d547eb9efefc9cc4e07e7f95188f3c1df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2371286Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Sean McAllister <smcallis@google.com>
Cr-Commit-Position: refs/heads/master@{#803136}

components/cookie_config/cookie_store_util.cc

@@ -11,7 +11,8 @@
 
 namespace cookie_config {
 
-#if defined(OS_WIN) || defined(OS_APPLE) || defined(OS_LINUX)
+#if defined(OS_WIN) || defined(OS_APPLE) || defined(OS_LINUX) || \
+    defined(OS_CHROMEOS)
 namespace {
 
 // Use the operating system's mechanisms to encrypt cookies before writing
@@ -63,10 +64,12 @@ base::LazyInstance<CookieOSCryptoDelegate>::DestructorAtExit
 net::CookieCryptoDelegate* GetCookieCryptoDelegate() {
   return g_cookie_crypto_delegate.Pointer();
 }
-#else   // defined(OS_WIN) || defined(OS_APPLE) || defined(OS_LINUX)
+#else   // defined(OS_WIN) || defined(OS_APPLE) || defined(OS_LINUX) ||
+        // defined(OS_CHROMEOS)
 net::CookieCryptoDelegate* GetCookieCryptoDelegate() {
   return NULL;
 }
-#endif  // defined(OS_WIN) || defined(OS_APPLE) || defined(OS_LINUX)
+#endif  // defined(OS_WIN) || defined(OS_APPLE) || defined(OS_LINUX) ||
+        // defined(OS_CHROMEOS)
 
 }  // namespace cookie_config