Style cleanup in preparation for auto-linting base/.

base/values.h

Index: base/values.h
diff --git a/base/values.h b/base/values.h
index fbe6b1ccf08d61a7a73b255229c5b0e9de5c000e..ba6989d004613af4a901a8fd8a7caa6ac3b8a2d3 100644
--- a/base/values.h
+++ b/base/values.h
@@ -301,7 +301,10 @@ class DictionaryValue : public Value {
     : private std::iterator<std::input_iterator_tag, const std::wstring> {
    public:
     explicit key_iterator(ValueMap::const_iterator itr) { itr_ = itr; }
-    key_iterator operator++() { ++itr_; return *this; }
+    key_iterator operator++() {
+      ++itr_;
+      return *this;
+    }
     const std::wstring& operator*() { return itr_->first; }
     bool operator!=(const key_iterator& other) { return itr_ != other.itr_; }
     bool operator==(const key_iterator& other) { return itr_ == other.itr_; }