Revert 76228 - Move core pieces of geolocation from chrome to content.This is...

content/browser/geolocation/location_provider.cc

-// Copyright (c) 2010 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 "content/browser/geolocation/location_provider.h"
-
-#include "base/logging.h"
-
-LocationProviderBase::LocationProviderBase() {
-}
-
-LocationProviderBase::~LocationProviderBase() {
-  DCHECK(CalledOnValidThread());
-}
-
-void LocationProviderBase::RegisterListener(ListenerInterface* listener) {
-  DCHECK(CalledOnValidThread());
-  DCHECK(listener);
-  std::pair<ListenerMap::iterator, bool> result =
-      listeners_.insert(std::make_pair(listener, 0));
-  DCHECK(result.first != listeners_.end());
-
-  int& ref_count = result.first->second;
-  const bool& is_new = result.second;
-  ++ref_count;
-
-  // Check the post condition...
-  if (is_new) {
-    DCHECK(ref_count == 1);
-  } else {
-    DCHECK(ref_count > 1);
-  }
-}
-
-void LocationProviderBase::UnregisterListener(ListenerInterface *listener) {
-  DCHECK(CalledOnValidThread());
-  DCHECK(listener);
-  ListenerMap::iterator iter = listeners_.find(listener);
-  if (iter != listeners_.end()) {
-    if (--iter->second == 0) {
-      listeners_.erase(iter);
-    }
-  }
-}
-
-bool LocationProviderBase::has_listeners() const {
-  return !listeners_.empty();
-}
-
-void LocationProviderBase::UpdateListeners() {
-  DCHECK(CalledOnValidThread());
-  for (ListenerMap::const_iterator iter = listeners_.begin();
-       iter != listeners_.end();
-       ++iter) {
-    iter->first->LocationUpdateAvailable(this);
-  }
-}
-
-#if !defined(OS_LINUX) && !defined(OS_MACOSX) && !defined(OS_WIN)
-LocationProviderBase* NewSystemLocationProvider() {
-  return NULL;
-}
-#endif