chromeos: Delete old, unused contacts code.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 86e217ad5e2306d5c5e2f4c64f81dd17978f8e5e..4705ee9d8f9463aed1b59361a7c27aacb106fcb3 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -554,10 +554,6 @@ const char kEnableBookmarkUndo[]            = "enable-bookmark-undo";
 // Print Proxy component within the service process.
 const char kEnableCloudPrintProxy[]         = "enable-cloud-print-proxy";
 
-// Enables fetching the user's contacts from Google and showing them in the
-// Chrome OS apps list.
-const char kEnableContacts[]                = "enable-contacts";
-
 // If true devtools experimental settings are enabled.
 const char kEnableDevToolsExperiments[]     = "enable-devtools-experiments";