Readding null checks for the set of extensions returned by GetInstalledExtensions.

chrome/browser/metrics/extensions_metrics_provider.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/metrics/extensions_metrics_provider.h"
 
 #include <set>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 175 matching lines @@
 
   // The off-store metric includes information from all loaded profiles at the
   // time when this metric is generated.
   std::vector<Profile*> profiles = profile_manager->GetLoadedProfiles();
   for (size_t i = 0u; i < profiles.size() && state < OFF_STORE; ++i) {
     extensions::InstallVerifier* verifier =
         extensions::ExtensionSystem::Get(profiles[i])->install_verifier();
 
     scoped_ptr<extensions::ExtensionSet> extensions(
         GetInstalledExtensions(profiles[i]));
+    if (!extensions)
+      continue;
 
     // Combine the state from each profile, always favoring the higher state as
     // defined by the order of ExtensionState.
     state = std::max(state, CheckForOffStore(*extensions.get(), *verifier));
   }
 
   system_profile->set_offstore_extensions_state(ExtensionStateAsProto(state));
 }
 
 void ExtensionsMetricsProvider::ProvideOccupiedBucketMetric(
     metrics::SystemProfileProto* system_profile) {
   // UMA reports do not support multiple profiles, but extensions are installed
   // per-profile.  We return the extensions installed in the primary profile.
   // In the future, we might consider reporting data about extensions in all
   // profiles.
   Profile* profile = GetMetricsProfile();
 
   scoped_ptr<extensions::ExtensionSet> extensions(
       GetInstalledExtensions(profile));
+  if (!extensions)
+    return;
 
   const int client_key = GetClientID() % kExtensionListClientKeys;
 
   std::set<int> buckets;
   for (extensions::ExtensionSet::const_iterator it = extensions->begin();
        it != extensions->end();
        ++it) {
     buckets.insert(HashExtension((*it)->id(), client_key));
   }
 
   for (std::set<int>::const_iterator it = buckets.begin(); it != buckets.end();
        ++it) {
     system_profile->add_occupied_extension_bucket(*it);
   }
 }