Just delete newlines rather than replacing them
Fix Debug vs. Release builds of libchromiumcontent

The Debug version of chromiumcontent.ninja was overwriting the Release
version (they were both being generated into vendor/chromium/src instead
of vendor/chromium/src/out/{Debug,Release}). So now we copy
chromiumcontent.gyp into the vendor/chromium/src tree so it works like
all other Chromium gyp files.