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

chrome/installer/setup/install.cc

Index: chrome/installer/setup/install.cc
diff --git a/chrome/installer/setup/install.cc b/chrome/installer/setup/install.cc
index b94576330a9edffff2eb1408d16931225c40f4c2..60e368b5f10f49379d2fb32cf850722ebe14a69b 100644
--- a/chrome/installer/setup/install.cc
+++ b/chrome/installer/setup/install.cc
@@ -183,8 +183,8 @@
     const base::FilePath& archive_path,
     const base::FilePath& src_path,
     const base::FilePath& temp_path,
-    const base::Version& new_version,
-    scoped_ptr<base::Version>* current_version) {
+    const Version& new_version,
+    scoped_ptr<Version>* current_version) {
   DCHECK(current_version);
 
   installer_state.UpdateStage(installer::BUILDING);
@@ -280,7 +280,7 @@
 }
 
 bool CreateVisualElementsManifest(const base::FilePath& src_path,
-                                  const base::Version& version) {
+                                  const Version& version) {
   // Construct the relative path to the versioned VisualElements directory.
   base::string16 elements_dir(base::ASCIIToUTF16(version.GetString()));
   elements_dir.push_back(base::FilePath::kSeparators[0]);
@@ -489,7 +489,7 @@
     const base::FilePath& src_path,
     const base::FilePath& prefs_path,
     const MasterPreferences& prefs,
-    const base::Version& new_version) {
+    const Version& new_version) {
   DCHECK(!installer_state.products().empty());
 
   // TODO(robertshield): Removing the pending on-reboot moves should be done
@@ -506,7 +506,7 @@
   installer_state.UpdateStage(installer::CREATING_VISUAL_MANIFEST);
   CreateVisualElementsManifest(src_path, new_version);
 
-  scoped_ptr<base::Version> existing_version;
+  scoped_ptr<Version> existing_version;
   InstallStatus result = InstallNewVersion(original_state, installer_state,
       setup_path, archive_path, src_path, install_temp_path, new_version,
       &existing_version);