Moved CrxInstaller and CrxInstallerError into extensions namespace

chrome/browser/extensions/crx_file.h

Index: chrome/browser/extensions/crx_file.h
diff --git a/chrome/browser/extensions/crx_file.h b/chrome/browser/extensions/crx_file.h
index c1f30405be25ab7c34c03e6b1cb2cddb1bbd02c2..2faa8ee9cffc31cc5ce9e780b3b8adc3e9c81bc5 100644
--- a/chrome/browser/extensions/crx_file.h
+++ b/chrome/browser/extensions/crx_file.h
@@ -9,10 +9,11 @@
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 
+namespace extensions {
+
 // CRX files have a header that includes a magic key, version number, and
 // some signature sizing information. Use CrxFile object to validate whether
 // the header is valid or not.
-
 class CrxFile {
  public:
 
@@ -70,4 +71,6 @@ class CrxFile {
   static bool HeaderIsValid(const Header& header, Error* error);
 };
 
+}  // namespace extensions
+
 #endif  // CHROME_BROWSER_EXTENSIONS_CRX_FILE_H_