Fix for URL opening code

chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc

Index: chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
diff --git a/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc b/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
index 99e8752bb20b00b2c654c7d017bf5d085d95af8f..28882ee9d22029724398fcbc3e55880e24da2c04 100644
--- a/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
+++ b/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
@@ -21,6 +21,9 @@
 #include "chrome/browser/chrome_browser_main.h"
 #include "chrome/browser/mac/bluetooth_utility.h"
 #include "chrome/browser/shell_integration.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "components/flags_ui/pref_service_flags_storage.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/content_switches.h"
@@ -510,7 +513,17 @@ void ChromeBrowserMainExtraPartsMetrics::PostBrowserStart() {
   is_screen_observer_ = true;
 
 #if !defined(OS_ANDROID)
-  metrics::BeginFirstWebContentsProfiling();
+  const BrowserList* browser_list = BrowserList::GetInstance();
+
+  auto first_browser = browser_list->begin();
+  if (first_browser != browser_list->end()) {
+    TabStripModel* tab_strip = (*first_browser)->tab_strip_model();
+    DCHECK(tab_strip);
+    // In case this code becomes reachable with empty tab strip,
+    // startup_metric_utils::SetNonBrowserUIDisplayed() should be used.
+    DCHECK(!tab_strip->empty());
+    metrics::BeginFirstWebContentsProfiling();
+  }
   metrics::TabUsageRecorder::InitializeIfNeeded();
 #endif  // !defined(OS_ANDROID)
 }