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

ios/chrome/browser/find_in_page/BUILD.gn

Index: ios/chrome/browser/find_in_page/BUILD.gn
diff --git a/ios/chrome/browser/find_in_page/BUILD.gn b/ios/chrome/browser/find_in_page/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..e65bf80e108ea642634d911d2ec59fd9941441fa
--- /dev/null
+++ b/ios/chrome/browser/find_in_page/BUILD.gn
@@ -0,0 +1,20 @@
+# 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("find_in_page") {
+  sources = [
+    "find_in_page_controller.h",
+    "find_in_page_controller.mm",
+    "find_in_page_model.h",
+    "find_in_page_model.mm",
+    "js_findinpage_manager.h",
+    "js_findinpage_manager.mm",
+  ]
+  deps = [
+    "//base",
+    "//ios/chrome/browser/web",
+    "//ios/web",
+  ]
+  libs = [ "CoreGraphics.framework" ]
+}