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

chrome/installer/util/browser_distribution.cc

Index: chrome/installer/util/browser_distribution.cc
diff --git a/chrome/installer/util/browser_distribution.cc b/chrome/installer/util/browser_distribution.cc
index 3e1e6a50e79574df1a04c600b2b1c9dd6fe7b397..072c800296eb9f43a8f57ed81facd2f0c91c6fd1 100644
--- a/chrome/installer/util/browser_distribution.cc
+++ b/chrome/installer/util/browser_distribution.cc
@@ -144,7 +144,7 @@ base::string16 BrowserDistribution::GetVersionKey() const {
 }
 
 void BrowserDistribution::DoPostUninstallOperations(
-    const Version& version, const base::FilePath& local_data_path,
+    const base::Version& version, const base::FilePath& local_data_path,
     const base::string16& distribution_data) {
 }