Consistently use namespaced base::Version in extensions code.

chrome/browser/extensions/external_provider_impl.cc

Index: chrome/browser/extensions/external_provider_impl.cc
diff --git a/chrome/browser/extensions/external_provider_impl.cc b/chrome/browser/extensions/external_provider_impl.cc
index 3673d8e6b8a280b5fd022a9aa5c2afb351f195db..c3a50886c1f12d208199d319a39e1147fa86d53a 100644
--- a/chrome/browser/extensions/external_provider_impl.cc
+++ b/chrome/browser/extensions/external_provider_impl.cc
@@ -343,7 +343,8 @@ void ExternalProviderImpl::RetrieveExtensionsFromPrefs(
         path = base_path.Append(external_crx);
       }
 
-      std::unique_ptr<Version> version(new Version(external_version));
+      std::unique_ptr<base::Version> version(
+          new base::Version(external_version));
       if (!version->IsValid()) {
         LOG(WARNING) << "Malformed extension dictionary for extension: "
                      << extension_id.c_str() << ".  Invalid version string \""
@@ -402,7 +403,7 @@ bool ExternalProviderImpl::HasExtension(
 bool ExternalProviderImpl::GetExtensionDetails(
     const std::string& id,
     Manifest::Location* location,
-    std::unique_ptr<Version>* version) const {
+    std::unique_ptr<base::Version>* version) const {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   CHECK(prefs_.get());
   CHECK(ready_);
@@ -422,7 +423,7 @@ bool ExternalProviderImpl::GetExtensionDetails(
       return false;
 
     if (version)
-      version->reset(new Version(external_version));
+      version->reset(new base::Version(external_version));
 
   } else {
     NOTREACHED();  // Chrome should not allow prefs to get into this state.
@@ -443,9 +444,9 @@ bool ExternalProviderImpl::HandleMinProfileVersion(
   if (profile_ &&
       extension->GetString(kMinProfileCreatedByVersion,
                            &min_profile_created_by_version)) {
-    Version profile_version(
+    base::Version profile_version(
         profile_->GetPrefs()->GetString(prefs::kProfileCreatedByVersion));
-    Version min_version(min_profile_created_by_version);
+    base::Version min_version(min_profile_created_by_version);
     if (min_version.IsValid() && profile_version.CompareTo(min_version) < 0) {
       unsupported_extensions->insert(extension_id);
       VLOG(1) << "Skip installing (or uninstall) external extension: "