Disable app banners in incognito.

chrome/browser/banners/app_banner_metrics.cc

 // Copyright 2015 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/banners/app_banner_metrics.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
 #include "chrome/browser/installable/installable_logging.h"
 
@@ skipping 43 matching lines @@
 
 void TrackBeforeInstallEvent(int event) {
   DCHECK_LT(BEFORE_INSTALL_EVENT_MIN, event);
   DCHECK_LT(event, BEFORE_INSTALL_EVENT_MAX);
   UMA_HISTOGRAM_SPARSE_SLOWLY(kBeforeInstallEventHistogram, event);
 }
 
 void TrackInstallableStatusCode(InstallableStatusCode code) {
   DCHECK_LE(NO_ERROR_DETECTED, code);
   DCHECK_LT(code, MAX_ERROR_CODE);
-  UMA_HISTOGRAM_SPARSE_SLOWLY(kInstallableStatusCodeHistogram, code);
+  if (code != IN_INCOGNITO) {
+    // Do not log that we are in incognito to UMA.
+    UMA_HISTOGRAM_SPARSE_SLOWLY(kInstallableStatusCodeHistogram, code);
+  }
 }
 
 }  // namespace banners