chrome: Move browser_otr_state.h into chrome namespace.

chrome/browser/metrics/metrics_service.cc

Index: chrome/browser/metrics/metrics_service.cc
diff --git a/chrome/browser/metrics/metrics_service.cc b/chrome/browser/metrics/metrics_service.cc
index 953f39b3bb86a1911cb94be1b3bae6ea25649430..41723aa479f981e3fcb83b1a744cd5d139b256ea 100644
--- a/chrome/browser/metrics/metrics_service.cc
+++ b/chrome/browser/metrics/metrics_service.cc
@@ -1864,7 +1864,7 @@ bool MetricsService::CanLogNotification(
   // We simply don't log anything to UMA if there is a single incognito
   // session visible. The problem is that we always notify using the orginal
   // profile in order to simplify notification processing.
-  return !browser::IsOffTheRecordSessionActive();
+  return !chrome::IsOffTheRecordSessionActive();
 }
 
 void MetricsService::RecordBooleanPrefValue(const char* path, bool value) {