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

ios/chrome/browser/crash_report/BUILD.gn

Index: ios/chrome/browser/crash_report/BUILD.gn
diff --git a/ios/chrome/browser/crash_report/BUILD.gn b/ios/chrome/browser/crash_report/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..8ed20f553eb15fdd8b5764071ac6f0ddc2887d71
--- /dev/null
+++ b/ios/chrome/browser/crash_report/BUILD.gn
@@ -0,0 +1,28 @@
+# 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("crash_report") {
+  sources = [
+    "breakpad_helper.h",
+    "breakpad_helper.mm",
+    "crash_keys.cc",
+    "crash_keys.h",
+    "crash_report_background_uploader.h",
+    "crash_report_background_uploader.mm",
+    "crash_report_multi_parameter.h",
+    "crash_report_multi_parameter.mm",
+    "crash_report_user_application_state.h",
+    "crash_report_user_application_state.mm",
+    "crash_upload_list.cc",
+    "crash_upload_list.h",
+  ]
+  deps = [
+    "//base",
+    "//breakpad:client",
+    "//components/crash/core/common",
+    "//components/upload_list",
+    "//ios/chrome/browser:browser_no_public_deps",
+    "//ios/web",
+  ]
+}