Add an API around zygoteHost so that chrome doesn't reach into the internal content implementation.

content/content_browser.gypi

 # Copyright (c) 2012 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.
 
 {
   'dependencies': [
     'browser/debugger/devtools_resources.gyp:devtools_resources',
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../net/net.gyp:http_server',
@@ skipping 114 matching lines @@
     'public/browser/web_contents_view.h',
     'public/browser/web_contents_view_mac_delegate.h',
     'public/browser/web_intents_dispatcher.h',
     'public/browser/web_ui.h',
     'public/browser/web_ui_controller.cc',
     'public/browser/web_ui_controller.h',
     'public/browser/web_ui_controller_factory.h',
     'public/browser/web_ui_message_handler.h',
     'public/browser/worker_service.h',
     'public/browser/worker_service_observer.h',
+    'public/browser/zygote_host_linux.h',
     'browser/accessibility/browser_accessibility.cc',
     'browser/accessibility/browser_accessibility.h',
     'browser/accessibility/browser_accessibility_cocoa.h',
     'browser/accessibility/browser_accessibility_cocoa.mm',
     'browser/accessibility/browser_accessibility_delegate_mac.h',
     'browser/accessibility/browser_accessibility_mac.h',
     'browser/accessibility/browser_accessibility_mac.mm',
     'browser/accessibility/browser_accessibility_manager.cc',
     'browser/accessibility/browser_accessibility_manager.h',
     'browser/accessibility/browser_accessibility_manager_mac.h',
@@ skipping 541 matching lines @@
     'browser/worker_host/message_port_service.cc',
     'browser/worker_host/message_port_service.h',
     'browser/worker_host/worker_document_set.cc',
     'browser/worker_host/worker_document_set.h',
     'browser/worker_host/worker_message_filter.cc',
     'browser/worker_host/worker_message_filter.h',
     'browser/worker_host/worker_process_host.cc',
     'browser/worker_host/worker_process_host.h',
     'browser/worker_host/worker_service_impl.cc',
     'browser/worker_host/worker_service_impl.h',
-    'browser/zygote_host_linux.cc',
-    'browser/zygote_host_linux.h',
+    'browser/zygote_host_impl_linux.cc',
+    'browser/zygote_host_impl_linux.h',
     'browser/zygote_main_linux.cc',
     '<(SHARED_INTERMEDIATE_DIR)/webkit/grit/devtools_resources.h',
     '<(SHARED_INTERMEDIATE_DIR)/webkit/grit/devtools_resources_map.cc',
     '<(SHARED_INTERMEDIATE_DIR)/webkit/grit/devtools_resources_map.h',
   ],
   'conditions': [
     ['OS!="win" and OS!="mac" and OS!="linux"', {
       'sources': [
         'browser/gamepad/platform_data_fetcher.cc',
       ]
@@ skipping 161 matching lines @@
       ],
     }],
     ['input_speech==0', {
       'sources/': [
         ['exclude', '^browser/speech/'],
       ],
     }],
   ],
 }