Clean up some GN/hermetic build changes.

No functional changes, just style.

BUG=

Review-Url: https://codereview.chromium.org/2401573005
Cr-Original-Commit-Position: refs/heads/master@{#424199}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 55e37ffdfc5d1aa4f47ae7e9bc0c8bc58ba23af5

config/mac/compile_xib.py

@@ -23,7 +23,7 @@ def main():
                       help='Path to Xcode.')
   args, unknown_args = parser.parse_known_args()
 
-  if (args.developer_dir):
+  if args.developer_dir:
     os.environ['DEVELOPER_DIR'] = args.developer_dir
 
   ibtool_args = [

config/mac/xcrun.py

@@ -16,7 +16,7 @@ if __name__ == '__main__':
                       help='Path to Xcode.')
   args, unknown_args = parser.parse_known_args()
 
-  if (args.developer_dir):
+  if args.developer_dir:
     os.environ['DEVELOPER_DIR'] = args.developer_dir
 
   rv = subprocess.check_call(['xcrun'] + unknown_args)

toolchain/toolchain.gni

@@ -47,13 +47,13 @@ declare_args() {
   # obtained with gclient sync after setting the environment variable
   # FORCE_MAC_TOOLCHAIN].
   use_system_xcode = true
-
-  # The path to the hermetic install of Xcode. Only relevant when
-  # use_system_xcode = false.
-  hermetic_xcode_path =
-      rebase_path("//build/mac_files/Xcode.app", "", root_build_dir)
 }
 
+# The path to the hermetic install of Xcode. Only relevant when
+# use_system_xcode = false.
+hermetic_xcode_path =
+    rebase_path("//build/mac_files/Xcode.app", "", root_build_dir)
+
 declare_args() {
   if (is_clang) {
     # Clang compiler version. Clang files are placed at version-dependent paths.