Split //ios/chrome/browser in multiple targets.

ios/chrome/browser/history/BUILD.gn

Index: ios/chrome/browser/history/BUILD.gn
diff --git a/ios/chrome/browser/history/BUILD.gn b/ios/chrome/browser/history/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..3fc1eb7b850b025fc9630e4de0f80a1fdf66761f
--- /dev/null
+++ b/ios/chrome/browser/history/BUILD.gn
@@ -0,0 +1,40 @@
+# 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.
+
+source_set("history") {
+  sources = [
+    "history_backend_client_impl.cc",
+    "history_backend_client_impl.h",
+    "history_client_impl.cc",
+    "history_client_impl.h",
+    "history_service_factory.cc",
+    "history_service_factory.h",
+    "history_utils.cc",
+    "history_utils.h",
+    "top_sites_factory.cc",
+    "top_sites_factory.h",
+    "web_history_service_factory.cc",
+    "web_history_service_factory.h",
+  ]
+  deps = [
+    "//base",
+    "//components/bookmarks/browser",
+    "//components/browser_sync",
+    "//components/dom_distiller/core",
+    "//components/history/core/browser",
+    "//components/history/ios/browser",
+    "//components/keyed_service/core",
+    "//components/keyed_service/ios",
+    "//components/pref_registry",
+    "//components/prefs",
+    "//components/signin/core/browser",
+    "//components/sync",
+    "//ios/chrome/browser:browser_no_public_deps",
+    "//ios/chrome/browser/browser_state",
+    "//ios/chrome/browser/signin",
+    "//ios/web",
+    "//net",
+    "//url",
+  ]
+}