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

ios/chrome/browser/rlz/BUILD.gn

Index: ios/chrome/browser/rlz/BUILD.gn
diff --git a/ios/chrome/browser/rlz/BUILD.gn b/ios/chrome/browser/rlz/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..602e9177d2411ffa63c600b2eadf322b96a77f5a
--- /dev/null
+++ b/ios/chrome/browser/rlz/BUILD.gn
@@ -0,0 +1,21 @@
+# 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("rlz") {
+  sources = [
+    "rlz_tracker_delegate_impl.cc",
+    "rlz_tracker_delegate_impl.h",
+  ]
+  deps = [
+    "//base",
+    "//components/omnibox/browser",
+    "//components/rlz",
+    "//components/search_engines",
+    "//ios/chrome/browser:browser_no_public_deps",
+    "//ios/chrome/browser/browser_state",
+    "//ios/chrome/browser/google",
+    "//ios/chrome/browser/search_engines",
+    "//ios/web",
+  ]
+}