[SystemInfo API] Finish TODOs in SystemInfoProvider

chrome/browser/extensions/api/system_info_storage/storage_info_provider.h

Index: chrome/browser/extensions/api/system_info_storage/storage_info_provider.h
diff --git a/chrome/browser/extensions/api/system_info_storage/storage_info_provider.h b/chrome/browser/extensions/api/system_info_storage/storage_info_provider.h
index cfa73970961acd7a87c1fdcefed95ce7a872b560..3866865e40541a9911e6f2a91853fa7b4f4c7413 100644
--- a/chrome/browser/extensions/api/system_info_storage/storage_info_provider.h
+++ b/chrome/browser/extensions/api/system_info_storage/storage_info_provider.h
@@ -62,6 +62,8 @@ class StorageInfoProvider : public SystemInfoProvider<StorageInfo> {
   virtual std::string GetDeviceIdForTransientId(
       const std::string& transient_id) const;
 
+  const StorageInfo& storage_info() const;
+
  protected:
   virtual ~StorageInfoProvider();
 
@@ -69,15 +71,15 @@ class StorageInfoProvider : public SystemInfoProvider<StorageInfo> {
   void SetWatchingIntervalForTesting(size_t ms) { watching_interval_ = ms; }
 
   // SystemInfoProvider implementations.
-  virtual bool QueryInfo(StorageInfo* info) OVERRIDE;
-  virtual void StartQueryInfoImpl() OVERRIDE;
+  virtual bool QueryInfo() OVERRIDE;
+  virtual void StartQueryInfoPostInitialization() OVERRIDE;
 
  private:
   typedef std::map<std::string, double> StorageTransientIdToSizeMap;
 
   // Query the available capacity of all known storage devices on the blocking
   // pool, including fixed and removable.
-  void QueryAvailableCapacityOnBlockingPool();
+  bool QueryAvailableCapacityOnBlockingPool();
   // Query the new attached removable storage info on the blocking pool.
   void QueryAttachedStorageInfoOnBlockingPool(const std::string& transient_id);
   // Run the QueryInfo() implementation after the StorageMonitor has been