Fix header guards in components/.

Mostly generated mechanically as follows:

git ls-files '*.h' | grep '^components/' | \
    xargs parallel cpplint.py --filter=-,+build/header_guard -- 2>&1 | \
    grep build/header_guard | tools/apply_cpplint_header_guard.py

Except for files in components/policy/core/common/management/, which
were sufficiently wrong that they required manual fixing.

Bug: 1200694
Change-Id: I019b0d5cd2dfc9ca54d09b7085824b0ea9a7f579
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2839703
Reviewed-by: Ted Choc <[email protected]>
Commit-Queue: Lei Zhang <[email protected]>
Cr-Commit-Position: refs/heads/master@{#874980}
diff --git a/components/onc/onc_pref_names.h b/components/onc/onc_pref_names.h
index 372e9c8d..cd73f53 100644
--- a/components/onc/onc_pref_names.h
+++ b/components/onc/onc_pref_names.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_ONC_PREF_NAMES_H_
-#define COMPONENTS_ONC_PREF_NAMES_H_
+#ifndef COMPONENTS_ONC_ONC_PREF_NAMES_H_
+#define COMPONENTS_ONC_ONC_PREF_NAMES_H_
 
 #include "components/onc/onc_export.h"
 
@@ -29,4 +29,4 @@
 
 }  // namespace onc
 
-#endif  // COMPONENTS_ONC_PREF_NAMES_H_
+#endif  // COMPONENTS_ONC_ONC_PREF_NAMES_H_