Simplify the default browser infobar.

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 079500888e4ab790aed45b4402431f217494498a..9e5963659cf45362f0bfae8c313280485e640ed1 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -72,6 +72,7 @@
 #include "components/dom_distiller/core/distilled_page_prefs.h"
 #include "components/flags_ui/pref_service_flags_storage.h"
 #include "components/gcm_driver/gcm_channel_status_syncer.h"
+#include "components/metrics/metrics_service.h"
 #include "components/network_time/network_time_tracker.h"
 #include "components/ntp_snippets/ntp_snippets_service.h"
 #include "components/omnibox/browser/zero_suggest_provider.h"
@@ -279,6 +280,9 @@ const char kGoogleGeolocationAccessEnabled[] =
     "googlegeolocationaccess.enabled";
 #endif
 
+// Deprecated 4/2016.
+const char kCheckDefaultBrowser[] = "browser.check_default_browser";
+
 }  // namespace
 
 namespace chrome {
@@ -592,6 +596,8 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
 #if BUILDFLAG(ENABLE_GOOGLE_NOW)
   registry->RegisterBooleanPref(kGoogleGeolocationAccessEnabled, false);
 #endif
+
+  registry->RegisterBooleanPref(kCheckDefaultBrowser, true);
 }
 
 void RegisterUserProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
@@ -673,6 +679,20 @@ void MigrateObsoleteProfilePrefs(Profile* profile) {
   // Added 3/2016.
   profile_prefs->ClearPref(kGoogleGeolocationAccessEnabled);
 #endif
+
+  // Added 4/2016.
+  if (!profile_prefs->GetBoolean(kCheckDefaultBrowser)) {
+    // Seed kDefaultBrowserLastDeclined with the install date.
+    metrics::MetricsService* metrics_service =
+        g_browser_process->metrics_service();
+    base::Time install_time =
+        metrics_service

[gab, 2016/04/12 17:09:37]

When would there ever not be a g_browser_process->metrics_service()? Tests?

[grt (UTC plus 2), 2016/04/12 17:12:46]

I suppose so, but don't know for sure. I'm just following directions as per
browser_process.h, which says "Services: any of these getters may return NULL"
just above metrics_service().

+            ? base::Time::FromTimeT(metrics_service->GetInstallDate())
+            : base::Time::Now();
+    profile_prefs->SetInt64(prefs::kDefaultBrowserLastDeclined,
+                            install_time.ToInternalValue());
+  }
+  profile_prefs->ClearPref(kCheckDefaultBrowser);
 }
 
 }  // namespace chrome