Move counters for passwords, history and autofill to components

chrome/browser/browsing_data/downloads_counter.h

Index: chrome/browser/browsing_data/downloads_counter.h
diff --git a/chrome/browser/browsing_data/downloads_counter.h b/chrome/browser/browsing_data/downloads_counter.h
index 29217f16b33b83ae7beff67492a0c7af64ca37f5..f3bd7627d21325bdf74dad8caff0fcc0ecef660b 100644
--- a/chrome/browser/browsing_data/downloads_counter.h
+++ b/chrome/browser/browsing_data/downloads_counter.h
@@ -16,12 +16,12 @@ class DownloadsCounter : public browsing_data::BrowsingDataCounter {
   explicit DownloadsCounter(Profile* profile);
   ~DownloadsCounter() override;
 
+  const char* GetPrefName() const override;
+
  private:
   // BrowsingDataRemover implementation.
   void Count() override;
 
-  const std::string pref_name_;
-
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadsCounter);