Reduce chrome.exe .text size by 50 KB with static_library

components/crash/content/app/BUILD.gn

 # Copyright 2014 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.
 
 assert(!is_ios)
 if (is_android) {
   import("//build/config/android/config.gni")
 }
 
 static_library("lib") {
   sources = [
     "crash_keys_win.cc",
     "crash_keys_win.h",
     "crash_reporter_client.cc",
     "crash_reporter_client.h",
   ]
 
   include_dirs = [ "../../../../breakpad/src" ]
 
   deps = [
     "//base",
   ]
 
   if (is_win) {
     deps += [ "//breakpad:breakpad_handler" ]
   }
 }
 
 # GYP version: components/crash.gypi:crash_component
-source_set("app") {
+static_library("app") {
   sources = [
     "crash_switches.cc",
     "crash_switches.h",
     "crashpad.h",
     "crashpad_mac.mm",
     "crashpad_win.cc",
     "run_as_crashpad_handler_win.cc",
     "run_as_crashpad_handler_win.h",
   ]
 
@@ skipping 164 matching lines @@
     ":lib",
     "//base",
     "//testing/gmock",
     "//testing/gtest",
   ]
 
   if (is_win) {
     deps += [ "//breakpad:client" ]
   }
 }