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..8eeeb67f5898ec2a30be7ffd76d2ae182ea50b38 100644
--- a/chrome/browser/chrome_browser_main.h
+++ b/chrome/browser/chrome_browser_main.h
@@ -101,7 +101,7 @@ class ChromeBrowserMainParts : public content::BrowserMainParts {
   }
 
   Profile* profile() { return profile_; }
-  bool do_first_run_tasks() const { return do_first_run_tasks_; }
+  bool is_first_run() const { return is_first_run_; }
 
   const PrefService* local_state() const { return local_state_; }
 
@@ -195,7 +195,7 @@ class ChromeBrowserMainParts : public content::BrowserMainParts {
 
   // Members initialized in PreMainMessageLoopRun, needed in
   // PreMainMessageLoopRunThreadsCreated.
-  bool do_first_run_tasks_;
+  bool is_first_run_;
   PrefService* local_state_;
   base::FilePath user_data_dir_;