Address some additional cleanup work needed for the component flash updates on Linux.

chrome/common/component_flash_hint_file_linux.h

Index: chrome/common/component_flash_hint_file_linux.h
diff --git a/chrome/common/component_flash_hint_file_linux.h b/chrome/common/component_flash_hint_file_linux.h
index abe0701ed86383516a4923ec9c5defcee8f1bd18..85694ce42843e1fbf4efccd86a29597b37707a6a 100644
--- a/chrome/common/component_flash_hint_file_linux.h
+++ b/chrome/common/component_flash_hint_file_linux.h
@@ -7,7 +7,9 @@
 
 #include "build/build_config.h"
 
-#if defined(OS_LINUX)
+#if !defined(OS_LINUX)
+#error "This file only applies to the Linux component update of Flash."
+#endif  // !defined(OS_LINUX)
 
 #include <string>
 
@@ -15,8 +17,6 @@ namespace base {
 class FilePath;
 }
 
-namespace chrome {
-
 // The APIs in this namespace wraps the component updated flash hint file, which
 // lives inside the PepperFlash folder of  the user-data-dir, so that the Linux
 // zygote process can preload the right version of flash.
@@ -46,7 +46,4 @@ bool TestExecutableMapping(const base::FilePath& path);
 
 }  // namespace component_flash_hint_file
 
-}  // namespace chrome
-
-#endif  // defined(OS_LINUX)
 #endif  // CHROME_COMMON_COMPONENT_FLASH_HINT_FILE_LINUX_H_