Replace image_messages.h with Mojo service

content/content_browser.gypi

Index: content/content_browser.gypi
diff --git a/content/content_browser.gypi b/content/content_browser.gypi
index 18a6b13982865b9395e58ab1e1e87a0061ffe668..5e806a11184774b7c11b59397676742e25ba923d 100644
--- a/content/content_browser.gypi
+++ b/content/content_browser.gypi
@@ -12,12 +12,14 @@
     '../device/vibration/vibration.gyp:device_vibration_mojo_bindings',
     '../google_apis/google_apis.gyp:google_apis',
     '../mojo/mojo_base.gyp:mojo_application_base',
+    '../mojo/mojo_base.gyp:mojo_geometry_lib',
     '../mojo/mojo_base.gyp:mojo_url_type_converters',
     '../mojo/mojo_services.gyp:network_service_bindings_lib',
     '../mojo/mojo_shell.gyp:mojo_shell_lib',
     '../net/net.gyp:net',
     '../net/net.gyp:net_extras',
     '../skia/skia.gyp:skia',
+    '../skia/skia.gyp:skia_mojo',
     '../sql/sql.gyp:sql',
     '../third_party/mojo/mojo_public.gyp:mojo_cpp_bindings',
     '../third_party/re2/re2.gyp:re2',
@@ -863,6 +865,8 @@
       'browser/host_zoom_level_context.h',
       'browser/host_zoom_map_impl.cc',
       'browser/host_zoom_map_impl.h',
+      'browser/image_downloader/image_downloader_dispatcher.cc',
+      'browser/image_downloader/image_downloader_dispatcher.h',
       'browser/in_process_io_surface_manager_mac.cc',
       'browser/in_process_io_surface_manager_mac.h',
       'browser/indexed_db/indexed_db.h',