Move DevToolsNetLogObserver to c/b/loader and create stub of network service interface

content/browser/loader/async_resource_handler.cc

Index: content/browser/loader/async_resource_handler.cc
diff --git a/content/browser/loader/async_resource_handler.cc b/content/browser/loader/async_resource_handler.cc
index 599767b01c1292ee6c3e7360492d120262fe7a5b..78e0dab415bb2318f7548a6154c65f18d018faa3 100644
--- a/content/browser/loader/async_resource_handler.cc
+++ b/content/browser/loader/async_resource_handler.cc
@@ -17,8 +17,8 @@
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/time/time.h"
-#include "content/browser/devtools/devtools_netlog_observer.h"
 #include "content/browser/host_zoom_map_impl.h"
+#include "content/browser/loader/netlog_observer.h"
 #include "content/browser/loader/resource_buffer.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/loader/resource_message_filter.h"
@@ -301,7 +301,7 @@ bool AsyncResourceHandler::OnRequestRedirected(
         redirect_info.new_url, request(), info->GetContext(), response);
   }
 
-  DevToolsNetLogObserver::PopulateResponseInfo(request(), response);
+  NetLogObserver::PopulateResponseInfo(request(), response);
   response->head.encoded_data_length = request()->GetTotalReceivedBytes();
   reported_transfer_size_ = 0;
   response->head.request_start = request()->creation_time();
@@ -342,7 +342,7 @@ bool AsyncResourceHandler::OnResponseStarted(ResourceResponse* response,
         request(), info->GetContext(), response, info->filter());
   }
 
-  DevToolsNetLogObserver::PopulateResponseInfo(request(), response);
+  NetLogObserver::PopulateResponseInfo(request(), response);
 
   const HostZoomMapImpl* host_zoom_map =
       static_cast<const HostZoomMapImpl*>(info->filter()->GetHostZoomMap());