Prevent guest views from issuing a search for empty text.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index c0ef9d4cee1999455a8a45d2cf484fdad4357c8d..013eafaad613b658c99ead5d8c620a2a348983dc 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -367,7 +367,6 @@ static bool DeviceScaleEnsuresTextQuality(float device_scale_factor) {
   // devices main thread antialiasing is a heavy burden.
   return device_scale_factor >= 1.5f;
 #endif
-
 }
 
 static bool PreferCompositingToLCDText(CompositorDependencies* compositor_deps,
@@ -674,7 +673,7 @@ void RenderViewImpl::Initialize(const ViewMsg_New_Params& params,
   if (opener_view_routing_id != MSG_ROUTING_NONE && was_created_by_renderer)
     opener_id_ = opener_view_routing_id;
 
-  display_mode_= params.initial_size.display_mode;
+  display_mode_ = params.initial_size.display_mode;
 
   // Ensure we start with a valid next_page_id_ from the browser.
   DCHECK_GE(next_page_id_, 0);
@@ -2293,6 +2292,8 @@ blink::WebPlugin* RenderViewImpl::GetWebPluginForFind() {
 void RenderViewImpl::OnFind(int request_id,
                             const base::string16& search_text,
                             const WebFindOptions& options) {
+  DCHECK(!search_text.empty());
+
   WebFrame* main_frame = webview()->mainFrame();
   blink::WebPlugin* plugin = GetWebPluginForFind();
   // Check if the plugin still exists in the document.
@@ -3081,7 +3082,7 @@ void RenderViewImpl::OnWasHidden() {
     (*plugin_it)->SetContainerVisibility(false);
   }
 #endif  // OS_MACOSX
-#endif // ENABLE_PLUGINS
+#endif  // ENABLE_PLUGINS
 }
 
 void RenderViewImpl::OnWasShown(bool needs_repainting,