Cleanup: services/network/public/mojom headers are sufficient for StoragePartitionImpl

No need for services/network/, since it doesn't use the concrete implementation
types (any more?).

Change-Id: I242540cd2bea4d135934ee0a2fa5b84a3e22f195
Bug: 1049894
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042250
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739256}

content/browser/storage_partition_impl.cc

@@ -81,11 +81,10 @@
 #include "net/url_request/url_request_context.h"
 #include "ppapi/buildflags/buildflags.h"
 #include "services/metrics/public/cpp/ukm_builders.h"
-#include "services/network/cookie_manager.h"
-#include "services/network/network_context.h"
-#include "services/network/network_service.h"
 #include "services/network/public/cpp/cross_thread_pending_shared_url_loader_factory.h"
 #include "services/network/public/cpp/features.h"
+#include "services/network/public/mojom/cookie_manager.mojom.h"
+#include "services/network/public/mojom/network_context.mojom.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "storage/browser/blob/blob_registry_impl.h"
 #include "storage/browser/blob/blob_storage_context.h"