Bring in latest Linux reference build.

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": "73514",
   "skia_revision": "632",
   "chromium_git": "http://git.chromium.org/git",
   "swig_revision": "40423",
@@ skipping 238 matching lines @@
     # NSS, for SSLClientSocketNSS.
     "src/third_party/nss":
       "/trunk/deps/third_party/nss@61580",
 
     "src/chrome/installer/mac/third_party/xz/xz":
       "/trunk/deps/third_party/xz@50504",
   },
   "unix": {
     # Linux, really.
     "src/chrome/tools/test/reference_build/chrome_linux":
-      "/trunk/deps/reference_builds/chrome_linux@41515",
+      "/trunk/deps/reference_builds/chrome_linux@68697",
 
     "src/third_party/xdg-utils":
       "/trunk/deps/third_party/xdg-utils@58316",
 
     "src/third_party/swig/linux":
       "/trunk/deps/third_party/swig/linux@" + Var("swig_revision"),
 
     "src/third_party/lss":
       (Var("googlecode_url") % "linux-syscall-support") + "/trunk/lss@3",
 
@@ skipping 31 matching lines @@
 ]
 
 
 hooks = [
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]