Moved theme related state from BrowserInstantController to InstantService.

chrome/renderer/searchbox/searchbox.cc

Index: chrome/renderer/searchbox/searchbox.cc
diff --git a/chrome/renderer/searchbox/searchbox.cc b/chrome/renderer/searchbox/searchbox.cc
index 1d873975e601c4e1e8fe4a90e35ef3ee56358c63..060cdf162050ea71acef662753a76b77f0f37c9f 100644
--- a/chrome/renderer/searchbox/searchbox.cc
+++ b/chrome/renderer/searchbox/searchbox.cc
@@ -75,6 +75,7 @@ SearchBox::SearchBox(content::RenderView* render_view)
       omnibox_font_size_(0),
       autocomplete_results_cache_(kMaxInstantAutocompleteResultItemCacheSize),
       most_visited_items_cache_(kMaxInstantMostVisitedItemCacheSize) {
+  theme_info_.Initialize();
 }
 
 SearchBox::~SearchBox() {
@@ -448,6 +449,8 @@ void SearchBox::OnSetDisplayInstantResults(bool display_instant_results) {
 }
 
 void SearchBox::OnThemeChanged(const ThemeBackgroundInfo& theme_info) {
+  DCHECK(theme_info. IsValid());
+
   theme_info_ = theme_info;
   if (render_view()->GetWebView() && render_view()->GetWebView()->mainFrame()) {
     extensions_v8::SearchBoxExtension::DispatchThemeChange(
@@ -481,7 +484,10 @@ void SearchBox::Reset() {
   start_margin_ = 0;
   is_focused_ = false;
   is_key_capture_enabled_ = false;
+
   theme_info_ = ThemeBackgroundInfo();
+  theme_info_.Initialize();
+
   // Don't reset display_instant_results_ to prevent clearing it on committed
   // results pages in extended mode. Otherwise resetting it is a no-op because
   // a new loader is created when it changes; see crbug.com/164662.