Convert ManifestManager IPCs to Mojo.

content/DEPS

 # Do NOT add chrome to the list below. We shouldn't be including files
 # from src/chrome in src/content. Also, we may only depend on files in
 # src/components that are shared with the mojo html_viewer.
 include_rules = [
   # The subdirectories in content/ will manually allow their own include
   # directories in content/ so we disallow all of them.
   "-content",
   "+content/app/resources/grit/content_resources.h",
   "+content/common",
   "+content/grit",
@@ skipping 11 matching lines @@
   "-cc/base/scoped_ptr_vector.h",
 
   "+crypto",
   "+grit/blink_resources.h",
   "+grit/content_strings.h",
 
   "+dbus",
   "+gpu",
   "+media",
   "+mojo/common",
+  "+mojo/converters/geometry",
   "+mojo/edk/embedder",
   "+mojo/edk/js",
   "+mojo/edk/test",
   "+mojo/public",
   "+net",
   "+ppapi",
   "+printing",
   "+sandbox",
   "+skia",
 
@@ skipping 70 matching lines @@
   "+jni",
 ]
 
 # content -> content/shell dependency is not allowed, except for browser tests.
 specific_include_rules = {
   ".*_browsertest[a-z_]*\.(cc|h)": [
     "+content/shell/browser",
     "+content/shell/common",
   ],
 }