Some C++11 cleanup of history types.

components/query_parser/snippet.cc

Index: components/query_parser/snippet.cc
diff --git a/components/query_parser/snippet.cc b/components/query_parser/snippet.cc
index f540be5ca32f3bda4998e2b8a016c4d34e66b819..3133d8feda2b9eff021d1e7138fb8c8adc3014a4 100644
--- a/components/query_parser/snippet.cc
+++ b/components/query_parser/snippet.cc
@@ -210,9 +210,16 @@ Snippet::Snippet() {
 
 Snippet::Snippet(const Snippet& other) = default;
 
+// TODO(bug 706963) this should be implemented as "= default" when Android
+// toolchain is updated.
+Snippet::Snippet(Snippet&& other) noexcept
+    : text_(std::move(other.text_)), matches_(std::move(other.matches_)) {}
+
 Snippet::~Snippet() {
 }
 
+Snippet& Snippet::operator=(const Snippet&) = default;
+
 void Snippet::ComputeSnippet(const MatchPositions& match_positions,
                              const std::string& document) {
   // The length of snippets we try to produce.