Fix presubmit format check and always use UTF-8 in Python on Windows.

PRESUBMIT.py

@@ -79,6 +79,12 @@ def CheckPatchFormatted(input_api, output_api):
 
     # Run git cl format and get return code.
     git_cl_format_code, _ = git_cl.RunGitWithCode(git_cl_format_cmd)
+    if git_cl_format_code not in (0, 2):
+        return [
+            output_api.PresubmitError(
+                f'Presubmit format check has failed, return code: {git_cl_format_code}'
+            )
+        ]
 
     is_format_required = git_cl_format_code == 2
 

build/commands/lib/config.js

@@ -1196,6 +1196,13 @@ Object.defineProperty(Config.prototype, 'defaultOptions', {
       env = this.addPythonPathToEnv(env, path.join(this.srcDir, ...p))
     })
     env.PYTHONUNBUFFERED = '1'
+    if (process.platform === 'win32') {
+      // UTF-8 is default on Linux/Mac, but on Windows CP1252 is used in most
+      // cases. This var makes Python use UTF-8 if encoding is not set
+      // explicitly in calls such as `open()`.
+      // https://peps.python.org/pep-0540/
+      env.PYTHONUTF8 = '1'
+    }
     env.TARGET_ARCH = this.gypTargetArch // for brave scripts
     env.RUSTUP_HOME = path.join(this.srcDir, 'third_party', 'rust-toolchain')
     // Fix `gclient runhooks` - broken since depot_tools a7b20b34f85432b5958963b75edcedfef9cf01fd