Fix header guard and namespace in android_webview

android_webview/browser/scoped_app_gl_state_restore.h

Index: android_webview/browser/scoped_app_gl_state_restore.h
diff --git a/android_webview/browser/scoped_app_gl_state_restore.h b/android_webview/browser/scoped_app_gl_state_restore.h
index b15d14bce6c206e7198509a808aa3a0c6e5ac698..48ec4618681a69a513d47cc890a589e81aa50b3e 100644
--- a/android_webview/browser/scoped_app_gl_state_restore.h
+++ b/android_webview/browser/scoped_app_gl_state_restore.h
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#ifndef ANDROID_WEBVIEW_BROWSER_SCOPED_APP_GL_STATE_RESTORE_H_
+#define ANDROID_WEBVIEW_BROWSER_SCOPED_APP_GL_STATE_RESTORE_H_
+
 #include <memory>
 #include <vector>
 
@@ -55,3 +58,5 @@ class ScopedAppGLStateRestore {
 };
 
 }  // namespace android_webview
+
+#endif  // ANDROID_WEBVIEW_BROWSER_SCOPED_APP_GL_STATE_RESTORE_H_