Revert 152735 - Reland Integrate invalidation API into ChromeToMobileService.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
===================================================================
--- chrome/common/pref_names.cc	(revision 152744)
+++ chrome/common/pref_names.cc	(working copy)
@@ -1745,8 +1745,9 @@
     "cloud_print.signin_dialog_size.height";
 
 #if !defined(OS_ANDROID)
-// The Chrome To Mobile service mobile device list pref.
+// The Chrome To Mobile service prefs; the device list and last update time.
 const char kChromeToMobileDeviceList[] = "chrome_to_mobile.device_list";
+const char kChromeToMobileTimestamp[] = "chrome_to_mobile.timestamp";
 #endif
 
 // The list of BackgroundContents that should be loaded when the browser