Revert of base: Remove using:: declaration from version.h header.

chrome/installer/util/fake_installation_state.h

Index: chrome/installer/util/fake_installation_state.h
diff --git a/chrome/installer/util/fake_installation_state.h b/chrome/installer/util/fake_installation_state.h
index d7018352e91eba10b7b310a73647561f1bf88ac9..c81cc5b5cfe44cba51638fc064dff529e3470982 100644
--- a/chrome/installer/util/fake_installation_state.h
+++ b/chrome/installer/util/fake_installation_state.h
@@ -18,9 +18,7 @@
 class FakeInstallationState : public InstallationState {
  public:
   // Takes ownership of |version|.
-  void AddChrome(bool system_install,
-                 bool multi_install,
-                 base::Version* version) {
+  void AddChrome(bool system_install, bool multi_install, Version* version) {
     FakeProductState chrome_state;
     chrome_state.set_version(version);
     chrome_state.set_multi_install(multi_install);