Move kInstallDate from chrome/common/pref_names.h to components/metrics/metrics_pref_names.h

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index b0260a6fabfdff1bfaeef89667505d31332b5be5..dd9cf2130a2712f7be0e1d8cb430db86a9b7ae38 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -106,6 +106,7 @@
 #include "chrome/installer/util/google_update_settings.h"
 #include "components/google/core/browser/google_util.h"
 #include "components/language_usage_metrics/language_usage_metrics.h"
+#include "components/metrics/metrics_pref_names.h"
 #include "components/metrics/metrics_service.h"
 #include "components/nacl/browser/nacl_browser.h"
 #include "components/nacl/browser/nacl_process_host.h"
@@ -937,9 +938,11 @@ int ChromeBrowserMainParts::PreCreateThreadsImpl() {
   // Now that all preferences have been registered, set the install date
   // for the uninstall metrics if this is our first run. This only actually
   // gets used if the user has metrics reporting enabled at uninstall time.
-  int64 install_date = local_state_->GetInt64(prefs::kInstallDate);
-  if (install_date == 0)
-    local_state_->SetInt64(prefs::kInstallDate, base::Time::Now().ToTimeT());
+  int64 install_date = local_state_->GetInt64(metrics::prefs::kInstallDate);
+  if (install_date == 0) {
+    local_state_->SetInt64(metrics::prefs::kInstallDate,
+                           base::Time::Now().ToTimeT());
+  }
 
 #if defined(OS_MACOSX)
   // Get the Keychain API to register for distributed notifications on the main