Fix linker warning in broadcast_channel.mojom-blink.obj.

third_party/WebKit/Source/platform/weborigin/BUILD.gn

+# Copyright 2016 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.
+
+component("weborigin") {
+  # This target is a logical part of the platform and only the platform target
+  # and internal mojo targets should depend on it.
+  visibility = [
+    "//third_party/WebKit/Source/platform",
+    "//third_party/WebKit/public:mojo_bindings",
+    "//url/mojo:url_mojom_gurl_blink_cpp_sources",
+    "//url/mojo:url_mojom_origin_blink_cpp_sources",
+  ]
+
+  sources = [
+    "KURL.cpp",
+    "KURL.h",
+    "KURLHash.h",
+    "KnownPorts.cpp",
+    "KnownPorts.h",
+    "OriginAccessEntry.cpp",
+    "OriginAccessEntry.h",
+    "Referrer.h",
+    "ReferrerPolicy.h",
+    "SchemeRegistry.cpp",
+    "SchemeRegistry.h",
+    "SecurityOrigin.cpp",
+    "SecurityOrigin.h",
+    "SecurityOriginCache.h",
+    "SecurityOriginHash.h",
+    "SecurityPolicy.cpp",
+    "SecurityPolicy.h",
+    "Suborigin.cpp",
+    "Suborigin.h",
+  ]
+
+  defines = [
+    "ORIGIN_IMPLEMENTATION=1",
+    "INSIDE_BLINK",
+  ]
+
+  configs += [
+    "//third_party/WebKit/Source:config",
+    "//third_party/WebKit/Source:non_test_config",
+    "//build/config/compiler:no_size_t_to_int_warning",
+  ]
+
+  public_deps = [
+    "//net",
+    "//third_party/WebKit/Source/platform:runtime_enabled_features",
+    "//third_party/WebKit/Source/wtf",
+    "//url",
+  ]
+}