Fixed code smell 'Unused local variables should be removed'.

tools/copyright_updater.py

@@ -72,7 +72,7 @@ def find_replace(directory, find, replace):
                     print("Done")
                 else:
                     print("N/A")
-            except Exception as e:
+            except Exception:
                 failed.append(current_file)
                 print("FAILED")
 

tools/dependency_inventory.py

@@ -65,7 +65,7 @@ def get_python_deps():
 
         try:
             distribution = pkg_resources.get_distribution(pkg)
-        except IndexError as e:
+        except IndexError:
             # The package probably isn't required on this version of Python,
             # thus we have no info about it.
             have_unknowns = True

tools/get_chromedriver.py

@@ -61,11 +61,11 @@ def get_chrome_version(args):
         def _read_registry(root, key, value):
             try:
                 hkey = winreg.OpenKey(root, key)
-            except Exception as e:
+            except Exception:
                 return None
             try:
                 (val, typ) = winreg.QueryValueEx(hkey, value)
-            except Exception as e:
+            except Exception:
                 winreg.CloseKey(hkey)
                 return None