Remove omnibox watcher.

chrome/browser/safe_browsing/incident_reporting/omnibox_interaction_incident.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/safe_browsing/incident_reporting/omnibox_interaction_incident.h"
-
-#include "base/logging.h"
-#include "chrome/common/safe_browsing/csd.pb.h"
-
-namespace safe_browsing {
-
-OmniboxInteractionIncident::OmniboxInteractionIncident(
-    scoped_ptr<ClientIncidentReport_IncidentData_OmniboxInteractionIncident>
-        omnibox_interaction_incident) {
-  DCHECK(omnibox_interaction_incident);
-  DCHECK(omnibox_interaction_incident->has_origin());
-  payload()->set_allocated_omnibox_interaction(
-      omnibox_interaction_incident.release());
-}
-
-OmniboxInteractionIncident::~OmniboxInteractionIncident() {
-}
-
-IncidentType OmniboxInteractionIncident::GetType() const {
-  return IncidentType::OMNIBOX_INTERACTION;
-}
-
-std::string OmniboxInteractionIncident::GetKey() const {
-  // Return a constant, as only one kind of suspicious interaction is detected.
-  return "1";
-}
-
-uint32_t OmniboxInteractionIncident::ComputeDigest() const {
-  // Return a constant (independent of the incident's payload) so that only the
-  // first suspicious interaction is reported.
-  return 1u;
-}
-
-}  // namespace safe_browsing