Update to Chrome 31.0.1650.57

This is the latest stable release of Chrome.
Update inside_webkit.patch for Chrome 31
Update v8_debug.patch for Chrome 31
Fix a typo in inside_webkit.patch
Move chromiumcontent.gyp into its own directory

This will give us a place to put more files to be copied into src/.
Teach gyp to link libchromiumcontent as C++

As of https://codereview.chromium.org/23475025, gyp will only link
modules as C++ if they contain at least one C++ source file. So now we
include an empty C++ source file in the target.
Compile content_app into libchromiumcontent

This is needed to get content::ContentMain and friends.
Merge pull request #32 from brightray/chrome-31

Update to Chrome 31.0.1650.57