Early return the Clipboard Url Provider when the omnibox wasn't focused.

components/open_from_clipboard/clipboard_url_provider.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/open_from_clipboard/clipboard_url_provider.h"
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/omnibox/autocomplete_input.h"
 #include "components/open_from_clipboard/clipboard_recent_content.h"
@@ skipping 13 matching lines @@
   DCHECK(clipboard_recent_content_);
 }
 
 ClipboardURLProvider::~ClipboardURLProvider() {
 }
 
 void ClipboardURLProvider::Start(const AutocompleteInput& input,
                                  bool minimal_changes,
                                  bool called_due_to_focus) {
   matches_.clear();
+  if (!called_due_to_focus)
+    return;
   // Attempt to add an AutocompleteMatch only if the user has not entered
   // anything in the omnibox.
   if (input.cursor_position() == base::string16::npos) {
     GURL url;
     if (clipboard_recent_content_->GetRecentURLFromClipboard(&url)) {
       DCHECK(url.is_valid());
       AutocompleteMatch match(this, kClipboardURLProviderRelevance, false,
                               AutocompleteMatchType::NAVSUGGEST_PERSONALIZED);
       match.allowed_to_be_default_match = true;
       match.destination_url = url;
       match.contents.assign(base::UTF8ToUTF16(url.spec()));
       AutocompleteMatch::ClassifyLocationInString(
           base::string16::npos, 0, match.contents.length(),
           ACMatchClassification::URL, &match.contents_class);
 
       match.description.assign(
           l10n_util::GetStringUTF16(IDS_LINK_FROM_CLIPBOARD));
       AutocompleteMatch::ClassifyLocationInString(
           base::string16::npos, 0, match.description.length(),
           ACMatchClassification::URL, &match.description_class);
 
       matches_.push_back(match);
     }
   }
   done_ = true;
 }