Fix infinite loop in grit headers clobbering script.

build/win/clobber_generated_headers.py

Index: build/win/clobber_generated_headers.py
diff --git a/build/win/clobber_generated_headers.py b/build/win/clobber_generated_headers.py
index 7b90b37927c286e10544e4fc7eb87f9787405ec6..cfcf83b831e5576fc190076883a03f074a5736a4 100644
--- a/build/win/clobber_generated_headers.py
+++ b/build/win/clobber_generated_headers.py
@@ -22,6 +22,8 @@ def total_split(path):
   components = []
   while path:
     head, tail = os.path.split(path)
+    if not tail:
+      break
     components.append(tail)
     path = head
   return list(reversed(components))
@@ -46,4 +48,4 @@ for path in sys.argv[1:]:
         os.remove(full_path)
         print 'Clobbered ' + full_path
       except OSError:
-        print 'Could not remove ' + full_path + '. Continuing.'
+        print 'Could not remove ' + full_path + '. Continuing.'