Update some uses of Value in chrome/browser to use the base:: namespace.

chrome/browser/content_settings/content_settings_policy_provider.h

Index: chrome/browser/content_settings/content_settings_policy_provider.h
diff --git a/chrome/browser/content_settings/content_settings_policy_provider.h b/chrome/browser/content_settings/content_settings_policy_provider.h
index 6366df7eff439595db26cddc1b527f355a78a448..0bd4b2ef8b397ab2f4e5b064f0883eedabd8a5b9 100644
--- a/chrome/browser/content_settings/content_settings_policy_provider.h
+++ b/chrome/browser/content_settings/content_settings_policy_provider.h
@@ -41,7 +41,7 @@ class PolicyProvider : public ObservableProvider {
       const ContentSettingsPattern& secondary_pattern,
       ContentSettingsType content_type,
       const ResourceIdentifier& resource_identifier,
-      Value* value) OVERRIDE;
+      base::Value* value) OVERRIDE;
 
   virtual void ClearAllContentSettingsRules(
       ContentSettingsType content_type) OVERRIDE;