Clear power consumption auditing data when you clear history.

This prevents the power consumption data from accidentally leaking visited websites after clearing browser history.

Review URL: https://codereview.chromium.org/514433002

Cr-Commit-Position: refs/heads/master@{#295558}

chrome/browser/browsing_data/browsing_data_remover.cc

@@ -51,6 +51,8 @@
 #include "components/nacl/browser/nacl_browser.h"
 #include "components/nacl/browser/pnacl_host.h"
 #include "components/password_manager/core/browser/password_store.h"
+#include "components/power/origin_power_map.h"
+#include "components/power/origin_power_map_factory.h"
 #include "components/search_engines/template_url_service.h"
 #include "components/web_cache/browser/web_cache_manager.h"
 #include "content/public/browser/browser_thread.h"
@@ -304,6 +306,12 @@ void BrowsingDataRemover::RemoveImpl(int remove_mask,
 #endif
     }
 
+    // The power consumption history by origin contains details of websites
+    // that were visited.
+    power::OriginPowerMap* origin_power_map =
+        power::OriginPowerMapFactory::GetForBrowserContext(profile_);
+    origin_power_map->ClearOriginMap();
+
     // Need to clear the host cache and accumulated speculative data, as it also
     // reveals some history: we have no mechanism to track when these items were
     // created, so we'll clear them all. Better safe than sorry.

components/power/origin_power_map.cc

@@ -59,4 +59,9 @@ void OriginPowerMap::OnAllOriginsUpdated() {
   callback_list_.Notify();
 }
 
+void OriginPowerMap::ClearOriginMap() {
+  origin_map_.clear();
+  total_consumed_ = 0;
+}
+
 }  // namespace power

components/power/origin_power_map.h

@@ -43,6 +43,9 @@ class OriginPowerMap : public KeyedService {
   // updating for all origins this cycle.
   void OnAllOriginsUpdated();
 
+  // Clears all URLs out of the map.
+  void ClearOriginMap();
+
  private:
   // OriginMap maps a URL to the amount of power consumed by the URL using the
   // same units as |total_consumed_|.