Revert "Add precompiled headers to GN build for large targets."

ui/gl/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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 86 matching lines @@
     "gpu_timing.cc",
     "gpu_timing.h",
     "scoped_binders.cc",
     "scoped_binders.h",
     "scoped_make_current.cc",
     "scoped_make_current.h",
     "sync_control_vsync_provider.cc",
     "sync_control_vsync_provider.h",
   ]
 
-  configs += [ "//build/config:precompiled_headers" ]
   defines = [ "GL_IMPLEMENTATION" ]
 
   include_dirs = [
     "//third_party/switfshader/include",
     "//third_party/mesa/src/include",
   ]
 
   all_dependent_configs = [ ":gl_config" ]
 
   public_configs = [ "//third_party/khronos:khronos_headers" ]
@@ skipping 231 matching lines @@
     deps = [
       ":surface_jni_headers",
     ]
     sources = [
       "../android/java/src/org/chromium/ui/gl/SurfaceTextureListener.java",
       "../android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java",
     ]
     jni_package = "ui/gl"
   }
 }