OOR-CORS: move public/platform/CORSStatus to platform/loader/cors

CORSStatus.h is placed at public/platform, but is not used outside
Blink. This patch is a mechanical change to move the CORSStatus.h
to platform/loader/cors.

Bug: 736308
Change-Id: I0febd97b85fe8ad9ce7866925831b043e494081d
Reviewed-on: https://chromium-review.googlesource.com/892728Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533594}

third_party/WebKit/Source/platform/loader/fetch/Resource.h

@@ -33,6 +33,7 @@
 #include "platform/WebTaskRunner.h"
 #include "platform/instrumentation/tracing/web_process_memory_dump.h"
 #include "platform/loader/SubresourceIntegrity.h"
+#include "platform/loader/cors/CORSStatus.h"
 #include "platform/loader/fetch/CachedMetadataHandler.h"
 #include "platform/loader/fetch/IntegrityMetadata.h"
 #include "platform/loader/fetch/ResourceError.h"
@@ -51,7 +52,6 @@
 #include "platform/wtf/text/AtomicString.h"
 #include "platform/wtf/text/TextEncoding.h"
 #include "platform/wtf/text/WTFString.h"
-#include "public/platform/CORSStatus.h"
 #include "public/platform/WebDataConsumerHandle.h"
 #include "public/platform/WebScopedVirtualTimePauser.h"