components: Add out-of-line copy ctors for complex classes.

This patch adds out of line copy constructors for classes that our
clang-plugin considers heavy. This is an effort to enable copy
constructor checks by default.

BUG=436357
[email protected], [email protected], [email protected]
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1728033002

Cr-Commit-Position: refs/heads/master@{#377717}
diff --git a/components/search_engines/util.h b/components/search_engines/util.h
index baf822c..1b7d3eec 100644
--- a/components/search_engines/util.h
+++ b/components/search_engines/util.h
@@ -62,6 +62,7 @@
 
 struct ActionsFromPrepopulateData {
   ActionsFromPrepopulateData();
+  ActionsFromPrepopulateData(const ActionsFromPrepopulateData& other);
   ~ActionsFromPrepopulateData();
 
   TemplateURLService::TemplateURLVector removed_engines;