Remove kDistroDict from Preferences.

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 dd7aa64552f037cbd86a55a92219d26abf112daf..6cc78eadb2b7cf70110f8aeb96b1ee57eef396d4 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -1741,16 +1741,14 @@ int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
   // Init the RLZ library. This just binds the dll and schedules a task on the
   // file thread to be run sometime later. If this is the first run we record
   // the installation event.
-  PrefService* pref_service = profile_->GetPrefs();
-  int ping_delay = first_run::IsChromeFirstRun() ? master_prefs_->ping_delay :
-      pref_service->GetInteger(first_run::GetPingDelayPrefName().c_str());
+  int ping_delay = profile_->GetPrefs()->GetInteger(prefs::kRlzPingDelay);

[sky, 2017/03/01 03:52:09]

optional: How about renaming the pref kRlzPingDelaySeconds to make the units
clear?

[gab, 2017/03/01 04:28:02]

Done.

   // Negative ping delay means to send ping immediately after a first search is
   // recorded.
   rlz::RLZTracker::SetRlzDelegate(
       base::WrapUnique(new ChromeRLZTrackerDelegate));
   rlz::RLZTracker::InitRlzDelayed(
       first_run::IsChromeFirstRun(), ping_delay < 0,
-      base::TimeDelta::FromMilliseconds(abs(ping_delay)),
+      base::TimeDelta::FromSeconds(abs(ping_delay)),
       ChromeRLZTrackerDelegate::IsGoogleDefaultSearch(profile_),
       ChromeRLZTrackerDelegate::IsGoogleHomepage(profile_),
       ChromeRLZTrackerDelegate::IsGoogleInStartpages(profile_));