Migrate page_load_metrics out of components.

components/page_load_metrics/browser/BUILD.gn

Index: components/page_load_metrics/browser/BUILD.gn
diff --git a/components/page_load_metrics/browser/BUILD.gn b/components/page_load_metrics/browser/BUILD.gn
deleted file mode 100644
index 232af6b24d0478858c115c857e0b56f2f15f0807..0000000000000000000000000000000000000000
--- a/components/page_load_metrics/browser/BUILD.gn
+++ /dev/null
@@ -1,45 +0,0 @@
-# Copyright 2015 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.
-
-# GYP version: components/page_load_metrics.gypi:page_load_metrics_browser
-static_library("browser") {
-  sources = [
-    "metrics_web_contents_observer.cc",
-    "metrics_web_contents_observer.h",
-    "page_load_metrics_observer.cc",
-    "page_load_metrics_observer.h",
-    "page_load_metrics_util.cc",
-    "page_load_metrics_util.h",
-  ]
-  public_deps = [
-    "//content/public/browser",
-  ]
-  deps = [
-    "//base",
-    "//components/page_load_metrics/common",
-    "//components/rappor",
-    "//ipc",
-    "//net",
-    "//third_party/WebKit/public:blink_headers",
-    "//ui/base",
-  ]
-}
-
-source_set("unit_tests") {
-  testonly = true
-  sources = [
-    "metrics_web_contents_observer_unittest.cc",
-  ]
-  deps = [
-    ":browser",
-    "//base",
-    "//base/test:test_support",
-    "//components/page_load_metrics/common",
-    "//components/rappor:test_support",
-    "//content/test:test_support",
-    "//net",
-    "//testing/gtest",
-    "//third_party/WebKit/public:blink_headers",
-  ]
-}