Consistently use namespaced base::Version in chrome/installer.

chrome/installer/setup/install.h

Index: chrome/installer/setup/install.h
diff --git a/chrome/installer/setup/install.h b/chrome/installer/setup/install.h
index 9adb7a906c5a2fc6eb354cfa72cc16a37e758627..3671c6b6bdedb1719e5a29bb4458d716db8b7233 100644
--- a/chrome/installer/setup/install.h
+++ b/chrome/installer/setup/install.h
@@ -71,7 +71,7 @@ void EscapeXmlAttributeValueInSingleQuotes(base::string16* att_value);
 // |src_path|\VisualElements exists.
 // Returns true unless the manifest is supposed to be created, but fails to be.
 bool CreateVisualElementsManifest(const base::FilePath& src_path,
-                                  const Version& version);
+                                  const base::Version& version);
 
 // Overwrites shortcuts (desktop, quick launch, and start menu) if they are
 // present on the system.
@@ -127,7 +127,7 @@ InstallStatus InstallOrUpdateProduct(
     const base::FilePath& src_path,
     const base::FilePath& prefs_path,
     const installer::MasterPreferences& prefs,
-    const Version& new_version);
+    const base::Version& new_version);
 
 // Performs installation-related tasks following an OS upgrade.
 // |chrome| The installed product (must be a browser).