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

chrome/installer/setup/install_unittest.cc

Index: chrome/installer/setup/install_unittest.cc
diff --git a/chrome/installer/setup/install_unittest.cc b/chrome/installer/setup/install_unittest.cc
index 8fc802690befb059e5b8e870cb98c433f20ed3dd..38eb4f0d43add0ed94fc9f6d227580cacf83f9a0 100644
--- a/chrome/installer/setup/install_unittest.cc
+++ b/chrome/installer/setup/install_unittest.cc
@@ -49,7 +49,7 @@ class CreateVisualElementsManifestTest : public testing::Test {
     // Create a temp directory for testing.
     ASSERT_TRUE(test_dir_.CreateUniqueTempDir());
 
-    version_ = Version("0.0.0.0");
+    version_ = base::Version("0.0.0.0");
 
     version_dir_ = test_dir_.path().AppendASCII(version_.GetString());
     ASSERT_TRUE(base::CreateDirectory(version_dir_));
@@ -67,7 +67,7 @@ class CreateVisualElementsManifestTest : public testing::Test {
   base::ScopedTempDir test_dir_;
 
   // A dummy version number used to create the version directory.
-  Version version_;
+  base::Version version_;
 
   // The path to |test_dir_|\|version_|.
   base::FilePath version_dir_;