Update all users of base::Version to explicitly specify the namespace, and clean up the header.

chrome/browser/extensions/external_policy_loader_unittest.cc

Index: chrome/browser/extensions/external_policy_loader_unittest.cc
diff --git a/chrome/browser/extensions/external_policy_loader_unittest.cc b/chrome/browser/extensions/external_policy_loader_unittest.cc
index 8f70dbad6e2c264016f4d4592f7d8a92bcb69f72..f889f75b95f0129007ba68ee3d45cb0f8170a81b 100644
--- a/chrome/browser/extensions/external_policy_loader_unittest.cc
+++ b/chrome/browser/extensions/external_policy_loader_unittest.cc
@@ -70,7 +70,7 @@ class MockExternalPolicyProviderVisitor
   }
 
   virtual bool OnExternalExtensionFileFound(const std::string& id,
-                                            const Version* version,
+                                            const base::Version* version,
                                             const base::FilePath& path,
                                             Manifest::Location unused,
                                             int unused2,
@@ -87,7 +87,7 @@ class MockExternalPolicyProviderVisitor
 
     // Provider returns the correct location when asked.
     Manifest::Location location1;
-    scoped_ptr<Version> version1;
+    scoped_ptr<base::Version> version1;
     provider_->GetExtensionDetails(id, &location1, &version1);
     EXPECT_EQ(Manifest::EXTERNAL_POLICY_DOWNLOAD, location1);
     EXPECT_FALSE(version1.get());