Move many standalone files from web/ to (core|modules)/exported/.

third_party/WebKit/Source/modules/exported/BUILD.gn

Index: third_party/WebKit/Source/modules/exported/BUILD.gn
diff --git a/third_party/WebKit/Source/modules/exported/BUILD.gn b/third_party/WebKit/Source/modules/exported/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..b23096d5f4e6ce96e039a17dd7a25526a1c0a8bc
--- /dev/null
+++ b/third_party/WebKit/Source/modules/exported/BUILD.gn
@@ -0,0 +1,15 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+import("//third_party/WebKit/Source/modules/modules.gni")
+
+blink_modules_sources("exported") {
+  sources = [
+    "WebCryptoNormalize.cpp",
+    "WebDOMFileSystem.cpp",
+    "WebDOMMediaStreamTrack.cpp",
+    "WebDatabase.cpp",
+  ]
+
+  defines = [ "BLINK_MODULES_IMPLEMENTATION=1" ]
+}