put this file in gaia main folder and run $ python relayout.py to replace layout breakpoint

relayout.py

# put this file in gaia main folder and run
# python relayout.py

# 768 -> 600
originWidth = 768
targetWidth = 600

# find and replace string
import os, fnmatch
def findReplace(directory, find, replace, filePattern):
    for path, dirs, files in os.walk(os.path.abspath(directory)):
        for filename in fnmatch.filter(files, filePattern):
            filepath = os.path.join(path, filename)
            with open(filepath) as f:
                s = f.read()
            s = s.replace(find, replace)
            with open(filepath, "w") as f:
                f.write(s)

findReplace("apps", str(originWidth), str(targetWidth), "*.css")
findReplace("shared/js/", str(originWidth-1), str(targetWidth-1), "screen_layout.js")