Merge 3 different ways of obtaining first run state into a single one.

chrome/browser/chrome_browser_main.h

Index: chrome/browser/chrome_browser_main.h
diff --git a/chrome/browser/chrome_browser_main.h b/chrome/browser/chrome_browser_main.h
index 0e092e49ac9ea5126fd83bbc70b45690b576fb96..e7cac1d3ca33a61e83f0fa6574d21b8d6fceea40 100644
--- a/chrome/browser/chrome_browser_main.h
+++ b/chrome/browser/chrome_browser_main.h
@@ -101,7 +101,6 @@ class ChromeBrowserMainParts : public content::BrowserMainParts {
   }
 
   Profile* profile() { return profile_; }
-  bool do_first_run_tasks() const { return do_first_run_tasks_; }
 
   const PrefService* local_state() const { return local_state_; }
 
@@ -121,8 +120,7 @@ class ChromeBrowserMainParts : public content::BrowserMainParts {
   bool IsMetricsReportingEnabled();
 
   // Record time from process startup to present time in an UMA histogram.
-  // |is_first_run| - is the current launch part of a first run.
-  void RecordBrowserStartupTime(bool is_first_run);
+  void RecordBrowserStartupTime();
 
   // Records a time value to an UMA histogram in the context of the
   // PreReadExperiment field-trial. This also reports to the appropriate
@@ -195,7 +193,6 @@ class ChromeBrowserMainParts : public content::BrowserMainParts {
 
   // Members initialized in PreMainMessageLoopRun, needed in
   // PreMainMessageLoopRunThreadsCreated.
-  bool do_first_run_tasks_;
   PrefService* local_state_;
   base::FilePath user_data_dir_;