Clean up a few more unused globals.

chrome/browser/component_updater/component_updater_configurator.cc

Index: chrome/browser/component_updater/component_updater_configurator.cc
diff --git a/chrome/browser/component_updater/component_updater_configurator.cc b/chrome/browser/component_updater/component_updater_configurator.cc
index bc814f29097ec4f35d24d3c6253a4000e30cdb3a..948e682802aa4951e297d8f3c568c536e36512b4 100644
--- a/chrome/browser/component_updater/component_updater_configurator.cc
+++ b/chrome/browser/component_updater/component_updater_configurator.cc
@@ -35,8 +35,6 @@ const char kSwitchFastUpdate[] = "fast-update";
 const char kSwitchOutOfProcess[] = "out-of-process";
 // Add "testrequest=1" parameter to the update check query.
 const char kSwitchRequestParam[] = "test-request";
-// Disables differential updates.
-const char kSwitchDisableDeltaUpdates[] = "disable-delta-updates";
 // Disables pings. Pings are the requests sent to the update server that report
 // the success or the failure of component install or update attempts.
 extern const char kSwitchDisablePings[] = "disable-pings";
@@ -52,6 +50,11 @@ const char kDefaultUrlSource[] =
 // The url to send the pings to.
 const char kPingUrl[] = "http://tools.google.com/service/update2";
 
+#if defined(OS_WIN)
+// Disables differential updates.
+const char kSwitchDisableDeltaUpdates[] = "disable-delta-updates";
+#endif  // defined(OS_WIN)
+
 // Returns true if and only if |test| is contained in |vec|.
 bool HasSwitchValue(const std::vector<std::string>& vec, const char* test) {
   if (vec.empty())