Decode URL before mapping it to a file name
Decode URL before mapping it to a file name

so that filenames with spaces are correctly supported.
Patch contributed by Nikita Vasilyev.

BUG=http://code.google.com/p/devtools-save/issues/detail?id=2
TEST=see bug description
TBR=vsevik

vsevik/devtools-save,vsevik/devtools-save,vsevik/devtools-save,vsevik/devtools-save,vsevik/devtools-save,vsevik/devtools-save