Make chrome GN build work in component mode.

content/renderer/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/features.gni")
 import("//build/config/ui.gni")
 import("//content/renderer/renderer.gni")
 
 source_set("renderer") {
-  # Only targets in the content tree can depend directly on this target.
-  visibility = [ "//content/*" ]
+  # Only the public target should depend on this. All other targets (even
+  # internal content ones) should depend on the public one.
+  visibility = [ "//content/public/renderer:renderer_sources" ]
 
   sources = rebase_path(content_renderer_gypi_values.private_renderer_sources,
                         ".", "//content")
 
   configs += [
     "//content:content_implementation",
   ]
 
   deps = [
     # TODO(GYP) bug 376846 remove this. This should be inherited from //net but
     # those don't cross component boundaries.
     "//crypto:platform",
 
     "//base/allocator",
     "//cc",
     "//cc/blink",
     "//content:resources",
-    "//content/public/child",
     "//content/common:mojo_bindings",
-    "//content/public/child",
-    "//content/public/common",
+    "//content/public/child:child_sources",
+    "//content/public/common:common_sources",
     "//gin",
     "//gpu",
     "//jingle:jingle_glue",
     "//media",
     "//media/blink",
     "//mojo/bindings/js",
     "//mojo/environment:chromium",
     "//mojo/public/js/bindings",
     "//mojo/public/interfaces/application",
     "//net",
@@ skipping 135 matching lines @@
       "media/crypto/pepper_cdm_wrapper_impl.h",
       "media/crypto/ppapi_decryptor.cc",
       "media/crypto/ppapi_decryptor.h",
     ]
   }
 
   if (printing_mode == 1) {
     deps += [ "//printing" ]
   }
 }