Make MetricsService upload logs through an interface.

chrome/browser/metrics/metrics_service.h

Index: chrome/browser/metrics/metrics_service.h
===================================================================
--- chrome/browser/metrics/metrics_service.h	(revision 272759)
+++ chrome/browser/metrics/metrics_service.h	(working copy)
@@ -32,7 +32,6 @@
 #include "components/metrics/metrics_provider.h"
 #include "components/metrics/metrics_service_observer.h"
 #include "components/variations/active_field_trials.h"
-#include "net/url_request/url_fetcher_delegate.h"
 
 class GoogleUpdateMetricsProviderWin;
 class MetricsReportingScheduler;
@@ -54,6 +53,7 @@
 }
 
 namespace metrics {
+class MetricsLogUploader;
 class MetricsServiceClient;
 class MetricsStateManager;
 }
@@ -88,8 +88,7 @@
 
 class MetricsService
     : public base::HistogramFlattener,
-      public chrome_browser_metrics::TrackingSynchronizerObserver,
-      public net::URLFetcherDelegate {
+      public chrome_browser_metrics::TrackingSynchronizerObserver {
  public:
   // The execution phase of the browser.
   enum ExecutionPhase {
@@ -357,15 +356,9 @@
   // Uploads the currently staged log (which must be non-null).
   void SendStagedLog();
 
-  // Prepared the staged log to be passed to the server. Upon return,
-  // current_fetch_ should be reset with its upload data set to a compressed
-  // copy of the staged log.
-  void PrepareFetchWithStagedLog();
+  // Called after transmission completes (either successfully or with failure).
+  void OnLogUploadComplete(int response_code);
 
-  // Implementation of net::URLFetcherDelegate. Called after transmission
-  // completes (either successfully or with failure).
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
-
   // Reads, increments and then sets the specified integer preference.
   void IncrementPrefValue(const char* path);
 
@@ -457,9 +450,12 @@
   // initial stability log may be sent before this.
   scoped_ptr<MetricsLog> initial_metrics_log_;
 
-  // The outstanding transmission appears as a URL Fetch operation.
-  scoped_ptr<net::URLFetcher> current_fetch_;
+  // Instance of the helper class for uploading logs.
+  scoped_ptr<metrics::MetricsLogUploader> log_uploader_;
 
+  // Whether there is a current log upload in progress.
+  bool log_upload_in_progress_;
+
   // Whether the MetricsService object has received any notifications since
   // the last time a transmission was sent.
   bool idle_since_last_transmission_;