Move NetworkStateNotifier from core (and web) into platform/network

third_party/WebKit/Source/platform/BUILD.gn

Index: third_party/WebKit/Source/platform/BUILD.gn
diff --git a/third_party/WebKit/Source/platform/BUILD.gn b/third_party/WebKit/Source/platform/BUILD.gn
index d50fa0f165fae9cc2e188990a28ae2b6f815a807..5a2453ca5fb1470588a28346d7177d9c555b2b85 100644
--- a/third_party/WebKit/Source/platform/BUILD.gn
+++ b/third_party/WebKit/Source/platform/BUILD.gn
@@ -508,6 +508,7 @@ component("platform") {
     "exported/WebMemoryCoordinator.cpp",
     "exported/WebMessagePortChannelClient.cpp",
     "exported/WebMixedContent.cpp",
+    "exported/WebNetworkStateNotifier.cpp",
     "exported/WebPasswordCredential.cpp",
     "exported/WebPrerender.cpp",
     "exported/WebPrerenderingSupport.cpp",
@@ -1114,6 +1115,8 @@ component("platform") {
     "network/NetworkInstrumentation.cpp",
     "network/NetworkInstrumentation.h",
     "network/NetworkLog.h",
+    "network/NetworkStateNotifier.cpp",
+    "network/NetworkStateNotifier.h",
     "network/NetworkUtils.cpp",
     "network/NetworkUtils.h",
     "network/ParsedContentType.cpp",
@@ -1762,6 +1765,7 @@ test("blink_platform_unittests") {
     "network/EncodedFormDataTest.cpp",
     "network/HTTPParsersTest.cpp",
     "network/LinkHeaderTest.cpp",
+    "network/NetworkStateNotifierTest.cpp",
     "network/NetworkUtilsTest.cpp",
     "network/ParsedContentTypeTest.cpp",
     "network/ResourceRequestTest.cpp",