Pass parameter to FormCache::PruneInitialValueCaches by cref.

Bug: 1007974
Change-Id: Icc17b93647324cc347aae12cb4679461a2922077
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1883075
Auto-Submit: Christoph Schwering <schwering@google.com>
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Commit-Queue: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709945}

components/autofill/content/renderer/form_cache.cc

@@ -41,8 +41,8 @@ using blink::WebDocument;
 using blink::WebElement;
 using blink::WebFormControlElement;
 using blink::WebFormElement;
-using blink::WebLocalFrame;
 using blink::WebInputElement;
+using blink::WebLocalFrame;
 using blink::WebNode;
 using blink::WebSelectElement;
 using blink::WebString;
@@ -159,7 +159,7 @@ void LogDeprecationMessages(const WebFormControlElement& element) {
   std::string autocomplete_attribute =
       element.GetAttribute("autocomplete").Utf8();
 
-  static const char* const deprecated[] = { "region", "locality" };
+  static const char* const deprecated[] = {"region", "locality"};
   for (const char* str : deprecated) {
     if (autocomplete_attribute.find(str) == std::string::npos)
       continue;
@@ -558,7 +558,7 @@ bool FormCache::ShouldShowAutocompleteConsoleWarnings(
 }
 
 void FormCache::PruneInitialValueCaches(
-    const std::set<uint32_t> ids_to_retain) {
+    const std::set<uint32_t>& ids_to_retain) {
   // Prune initial_select_values_.
   for (auto iter = initial_select_values_.begin();
        iter != initial_select_values_.end();) {

components/autofill/content/renderer/form_cache.h

@@ -19,7 +19,7 @@
 namespace blink {
 class WebFormControlElement;
 class WebLocalFrame;
-}
+}  // namespace blink
 
 namespace autofill {
 
@@ -80,7 +80,7 @@ class FormCache {
 
   // Clears all entries from |initial_select_values_| and
   // |initial_checked_state_| whose keys not contained in |ids_to_retain|.
-  void PruneInitialValueCaches(const std::set<uint32_t> ids_to_retain);
+  void PruneInitialValueCaches(const std::set<uint32_t>& ids_to_retain);
 
   // The frame this FormCache is associated with. Weak reference.
   blink::WebLocalFrame* frame_;