clang/win: Enable -Wswitch.

chrome/browser/profiles/file_path_verifier_win.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/profiles/file_path_verifier_win.h"
 
 #include <windows.h>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 42 matching lines @@
       case internal::PATH_COMPARISON_FAILED_SAMEBASE:
         file_verification_result = was_redirected ?
             FILE_VERIFICATION_FAILED_SAMEBASE_REDIRECT :
             FILE_VERIFICATION_FAILED_SAMEBASE;
         break;
       case internal::PATH_COMPARISON_FAILED_SAMEDIR:
         file_verification_result = was_redirected ?
             FILE_VERIFICATION_FAILED_SAMEDIR_REDIRECT :
             FILE_VERIFICATION_FAILED_SAMEDIR;
         break;
+      case internal::PATH_COMPARISON_FAILED_UNKNOWN:
+        // file_verification_result was initialized to the right value above.
+        DCHECK_EQ(FILE_VERIFICATION_FAILED_UNKNOWN, file_verification_result);
+        break;
     }
   }
   return file_verification_result;
 }
 
 }  // namespace
 
 namespace internal {
 
 PathComparisonReason ComparePathsIgnoreCase(const base::FilePath& path1,
@@ skipping 15 matching lines @@
 
 }  // namespace internal
 
 void VerifyPreferencesFile(const base::FilePath& pref_file_path) {
   FileVerificationResult file_verification_result =
       VerifyFileAtPath(pref_file_path);
   UMA_HISTOGRAM_ENUMERATION("Stability.FileAtPath.Preferences",
                             file_verification_result,
                             NUM_FILE_VERIFICATION_RESULTS);
 }