Don't depend on /net for error codes in sky viewer.

sky/viewer/platform/platform_impl.cc

Index: sky/viewer/platform/platform_impl.cc
diff --git a/sky/viewer/platform/platform_impl.cc b/sky/viewer/platform/platform_impl.cc
index c186858f7c157c1ce53e006e24eb161131555bbd..06a2d9cb38d8340fd9883dc298f975226f300b49 100644
--- a/sky/viewer/platform/platform_impl.cc
+++ b/sky/viewer/platform/platform_impl.cc
@@ -5,11 +5,19 @@
 #include "sky/viewer/platform/platform_impl.h"
 
 #include "mojo/public/cpp/application/application_impl.h"
-#include "net/base/net_errors.h"
 #include "sky/viewer/platform/weburlloader_impl.h"
 
 namespace sky {
 
+namespace {
+// This corresponds to ERR_ABORTED in net/base/net_error_list.h.
+// TODO(ppi): declare an enum in the network service mojom so that the clients
+// don't need to hard-code these values.
+const int32_t kNetErrorAborted = -3;
+
+const char kErrorDomain[] = "net";
+}  // namespace
+
 PlatformImpl::PlatformImpl(mojo::ApplicationImpl* app)
     : main_thread_task_runner_(base::MessageLoop::current()->task_runner()) {
   app->ConnectToService("mojo:network_service", &network_service_);
@@ -37,8 +45,8 @@ blink::WebURLLoader* PlatformImpl::createURLLoader() {
 blink::WebURLError PlatformImpl::cancelledError(const blink::WebURL& url)
     const {
   blink::WebURLError error;
-  error.domain = blink::WebString::fromUTF8(net::kErrorDomain);
-  error.reason = net::ERR_ABORTED;
+  error.domain = blink::WebString::fromUTF8(kErrorDomain);
+  error.reason = kNetErrorAborted;
   error.unreachableURL = url;
   error.staleCopyInCache = false;
   error.isCancellation = true;