Add most missing blink files to .gn files

third_party/WebKit/Source/core/BUILD.gn

 # Copyright 2014 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("//build/config/chromecast_build.gni")
 import("//build/toolchain/toolchain.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
@@ skipping 134 matching lines @@
 # and only forward some of them.
 component("core") {
   output_name = "blink_core"
 
   visibility = []  # Allow re-assignment of list.
   visibility = [ "//third_party/WebKit/*" ]
 
   # If you create a new subdirectory, make a new BUILD file for that directory
   # and reference it in the deps below rather than adding the sources here.
   sources = [
+    "CoreExport.h",
     "CoreInitializer.cpp",
     "CoreInitializer.h",
   ]
 
   configs -= core_config_remove
   configs += core_config_add
 
   public_deps = [
     ":core_generated",
     "//skia",
@@ skipping 1277 matching lines @@
   sources = [
     "frame/csp/ContentSecurityPolicyFuzzer.cpp",
   ]
   deps = [
     ":core",
     "//third_party/WebKit/Source/platform:blink_fuzzer_test_support",
   ]
   dict = "//testing/libfuzzer/fuzzers/dicts/content_security_policy.dict"
   seed_corpus = "//testing/libfuzzer/fuzzers/content_security_policy_corpus"
 }