Implement GetSandboxType() on all platforms and implement for all process types.

content/public/common/sandbox_type.h

Index: content/public/common/sandbox_type.h
diff --git a/content/public/common/sandbox_type_mac.h b/content/public/common/sandbox_type.h
similarity index 70%
rename from content/public/common/sandbox_type_mac.h
rename to content/public/common/sandbox_type.h
index 6f8a6f0e11f78448746bd6d97f3198b76f2570f5..ef610fbed8e7e7ec6303a21829f5610f35ba02cb 100644
--- a/content/public/common/sandbox_type_mac.h
+++ b/content/public/common/sandbox_type.h
@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CONTENT_PUBLIC_COMMON_SANDBOX_TYPE_MAC_H_
-#define CONTENT_PUBLIC_COMMON_SANDBOX_TYPE_MAC_H_
+#ifndef CONTENT_PUBLIC_COMMON_SANDBOX_TYPE_H_
+#define CONTENT_PUBLIC_COMMON_SANDBOX_TYPE_H_
 
 namespace content {
 
-// Defines the Mac sandbox types known within content. Embedders can add
-// additional sandbox types with IDs starting with SANDBOX_TYPE_AFTER_LAST_TYPE.
+// Defines the sandbox types known within content. Embedders can add additional
+// sandbox types with IDs starting with SANDBOX_TYPE_AFTER_LAST_TYPE.
 
 enum SandboxType {
   // Not a valid sandbox type.
@@ -33,4 +33,4 @@ enum SandboxType {
 
 }  // namespace content
 
-#endif  // CONTENT_PUBLIC_COMMON_SANDBOX_TYPE_MAC_H_
+#endif  // CONTENT_PUBLIC_COMMON_SANDBOX_TYPE_H_