FBTF: Move ctors/dtors into implementation files. Adds ctors/dtors to non-POD structs.

chrome/browser/history/snippet.cc

Index: chrome/browser/history/snippet.cc
diff --git a/chrome/browser/history/snippet.cc b/chrome/browser/history/snippet.cc
index 6e3e93cf5a794179ee5141c6b662f2055315afb2..47c11c33b04405da0ea20bcf015fcd42a1bd6f8e 100644
--- a/chrome/browser/history/snippet.cc
+++ b/chrome/browser/history/snippet.cc
@@ -200,6 +200,12 @@ void Snippet::ConvertMatchPositionsToWide(
   }
 }
 
+Snippet::Snippet() {
+}
+
+Snippet::~Snippet() {
+}
+
 void Snippet::ComputeSnippet(const MatchPositions& match_positions,
                              const std::string& document) {
   // The length of snippets we try to produce.
@@ -284,3 +290,8 @@ void Snippet::ComputeSnippet(const MatchPositions& match_positions,
   utext_close(document_utext);
   swap(text_, snippet);
 }
+
+void Snippet::Swap(Snippet* other) {
+  text_.swap(other->text_);
+  matches_.swap(other->matches_);
+}