Move gin and v8 portion of profiling to child from common

chrome/child/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.
 
 static_library("child") {
   sources = [
+    "child_profiling.cc",
+    "child_profiling.h",
     "pdf_child_init.cc",
     "pdf_child_init.h",
     "v8_breakpad_support_win.cc",
     "v8_breakpad_support_win.h",
   ]
 
   configs += [ "//build/config/compiler:wexit_time_destructors" ]
 
   deps = [
     "//base",
     "//content/public/child",
     "//gin",
+    "//v8",
   ]
 }