Remove all unused variables.

third_party/WebKit/Tools/Scripts/webkitpy/common/system/user.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/common/system/user.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/common/system/user.py b/third_party/WebKit/Tools/Scripts/webkitpy/common/system/user.py
index 06385a79b8ad6beff1582c817ac7542f027910a3..5d83b556b6f54b6ce176e2eaba059a883cf0ec89 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/common/system/user.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/common/system/user.py
@@ -96,14 +96,14 @@ class User(object):
                             indices += range(int(parts[0]) - 1, int(parts[1]))
                         else:
                             indices.append(int(value) - 1)
-                except ValueError as err:
+                except ValueError:
                     continue
 
                 return [list_items[i] for i in indices]
             else:
                 try:
                     result = int(cls.prompt("Enter a number: ", raw_input=raw_input)) - 1
-                except ValueError as err:
+                except ValueError:
                     continue
                 return list_items[result]
 
@@ -128,7 +128,7 @@ class User(object):
             # Note: Not thread safe: http://bugs.python.org/issue2320
             child_process = subprocess.Popen([pager], stdin=subprocess.PIPE)
             child_process.communicate(input=message)
-        except IOError as e:
+        except IOError:
             pass
 
     def confirm(self, message=None, default=DEFAULT_YES, raw_input=raw_input):
@@ -144,7 +144,7 @@ class User(object):
         try:
             webbrowser.get()
             return True
-        except webbrowser.Error as e:
+        except webbrowser.Error:
             return False
 
     def open_url(self, url):