Fix needless environment scan in safe browsing incident reporting service.

chrome/browser/safe_browsing/incident_reporting/incident_reporting_service.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/safe_browsing/incident_reporting/incident_reporting_service.h"
 
 #include <math.h>
 
 #include <algorithm>
 #include <vector>
@@ skipping 380 matching lines @@
       profile->GetPrefs()->GetBoolean(prefs::kSafeBrowsingEnabled);
 
   // Start processing delayed analysis callbacks if this new profile
   // participates in safe browsing. Start is idempotent, so this is safe even if
   // they're already running.
   if (safe_browsing_enabled)
     delayed_analysis_callbacks_.Start();
 
   // Start a new report if this profile participates in safe browsing and there
   // are process-wide incidents.
-  if (safe_browsing_enabled && GetProfileContext(NULL))
+  if (safe_browsing_enabled && GetProfileContext(NULL) &&
+      GetProfileContext(NULL)->incidents.size()) {
     BeginReportProcessing();
+  }
 
   // TODO(grt): register for pref change notifications to start delayed analysis
   // and/or report processing if sb is currently disabled but subsequently
   // enabled.
 
   // Nothing else to do if a report is not being assembled.
   if (!report_)
     return;
 
   // Drop all incidents associated with this profile that were received prior to
@@ skipping 542 matching lines @@
       if (!profile->IsOffTheRecord())
         OnProfileDestroyed(profile);
       break;
     }
     default:
       break;
   }
 }
 
 }  // namespace safe_browsing