Refactor ownership model for FirstWebContentsProfiler.

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 f61e22a5f8f491a2fc78cef49132521e61cb601b..7739aac9a0928a30576132929a95cf24b21d3ce3 100644
--- a/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
+++ b/chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc
@@ -26,6 +26,10 @@
 #include "ui/events/event_switches.h"
 #include "ui/gfx/screen.h"
 
+#if !defined(OS_ANDROID)
+#include "chrome/browser/metrics/first_web_contents_profiler.h"
+#endif  // !defined(OS_ANDROID)
+
 #if defined(OS_ANDROID) && defined(__arm__)
 #include <cpu-features.h>
 #endif  // defined(OS_ANDROID) && defined(__arm__)
@@ -343,8 +347,7 @@ void ChromeBrowserMainExtraPartsMetrics::PostBrowserStart() {
   is_screen_observer_ = true;
 
 #if !defined(OS_ANDROID)
-  first_web_contents_profiler_ =
-      FirstWebContentsProfiler::CreateProfilerForFirstWebContents(this).Pass();
+  FirstWebContentsProfiler::Start();
 #endif  // !defined(OS_ANDROID)
 }
 
@@ -363,12 +366,6 @@ void ChromeBrowserMainExtraPartsMetrics::OnDisplayMetricsChanged(
     uint32_t changed_metrics) {
 }
 
-#if !defined(OS_ANDROID)
-void ChromeBrowserMainExtraPartsMetrics::ProfilerFinishedCollectingMetrics() {
-  first_web_contents_profiler_.reset();
-}
-#endif  // !defined(OS_ANDROID)
-
 void ChromeBrowserMainExtraPartsMetrics::EmitDisplaysChangedMetric() {
   int display_count = gfx::Screen::GetNativeScreen()->GetNumDisplays();
   if (display_count != display_count_) {