Adding a word to dictionary should remove spelling markers

(Chrome part).
This patch adds code for removing spelling markers under words on 
chrome's side.

BUG=3506

Review URL: https://codereview.chromium.org/411393004

Cr-Commit-Position: refs/heads/master@{#291232}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291232 0039d316-1c4b-4281-b951-d872f2087c98

chrome/renderer/spellchecker/spellcheck.cc

@@ -22,6 +22,7 @@
 #include "third_party/WebKit/public/web/WebView.h"
 
 using blink::WebVector;
+using blink::WebString;
 using blink::WebTextCheckingResult;
 using blink::WebTextDecorationType;
 
@@ -67,6 +68,30 @@ bool DocumentMarkersCollector::Visit(content::RenderView* render_view) {
   return true;
 }
 
+class DocumentMarkersRemover : public content::RenderViewVisitor {
+ public:
+  explicit DocumentMarkersRemover(const std::vector<std::string>& words);
+  virtual ~DocumentMarkersRemover() OVERRIDE {}
+  virtual bool Visit(content::RenderView* render_view) OVERRIDE;
+
+ private:
+  WebVector<WebString> words_;
+  DISALLOW_COPY_AND_ASSIGN(DocumentMarkersRemover);
+};
+
+DocumentMarkersRemover::DocumentMarkersRemover(
+    const std::vector<std::string>& words)
+    : words_(words.size()) {
+  for (size_t i = 0; i < words.size(); ++i)
+    words_[i] = WebString::fromUTF8(words[i]);
+}
+
+bool DocumentMarkersRemover::Visit(content::RenderView* render_view) {
+  if (render_view && render_view->GetWebView())
+    render_view->GetWebView()->removeSpellingMarkersUnderWords(words_);
+  return true;
+}
+
 }  // namespace
 
 class SpellCheck::SpellcheckRequest {
@@ -146,6 +171,10 @@ void SpellCheck::OnCustomDictionaryChanged(
     const std::vector<std::string>& words_added,
     const std::vector<std::string>& words_removed) {
   custom_dictionary_.OnCustomDictionaryChanged(words_added, words_removed);
+  if (words_added.empty())
+    return;
+  DocumentMarkersRemover markersRemover(words_added);
+  content::RenderView::ForEach(&markersRemover);
 }
 
 void SpellCheck::OnEnableAutoSpellCorrect(bool enable) {