Start moving core pieces of Chrome multi-process code to src\content.

DEPS

 vars = {
   # Use this googlecode_url variable only if there is an internal mirror for it.
   # If you do not know, use the full path while defining your new deps entry.
   "googlecode_url": "http://%s.googlecode.com/svn",
   "webkit_trunk": "http://svn.webkit.org/repository/webkit/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
   "webkit_revision": "78845",
   "chromium_git": "http://git.chromium.org/git",
   "swig_revision": "69281",
   "nacl_revision": "4340",
@@ skipping 291 matching lines @@
 ]
 
 
 # checkdeps.py shouldn't check include paths for files in these dirs:
 skip_child_includes = [
   "breakpad",
   "chrome_frame",
   "gears",
   "native_client",
   "o3d",
+  "pdf",
   "sdch",
   "skia",
   "testing",
   "third_party",
   "v8",
 ]
 
 
 hooks = [
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]