Reduce string copies in GURL creation

mandoline/ui/desktop_ui/browser_window.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 "mandoline/ui/desktop_ui/browser_window.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 285 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserWindow, web_view::mojom::WebViewClient implementation:
 
 void BrowserWindow::TopLevelNavigateRequest(mojo::URLRequestPtr request) {
   OnHideFindBar();
   Embed(std::move(request));
 }
 
 void BrowserWindow::TopLevelNavigationStarted(const mojo::String& url) {
-  GURL gurl(url);
+  GURL gurl(url.get());
   bool changed = current_url_ != gurl;
   current_url_ = gurl;
   if (changed)
     toolbar_view_->SetOmniboxText(base::UTF8ToUTF16(current_url_.spec()));
 }
 
 void BrowserWindow::LoadingStateChanged(bool is_loading, double progress) {
   progress_bar_->SetIsLoading(is_loading);
   progress_bar_->SetProgress(progress);
 }
@@ skipping 134 matching lines @@
   content_bounds.set_width(DIPSToPixels(progress_bar_bounds.width()));
   content_bounds.set_height(host->bounds().height() - content_bounds.y() -
                             DIPSToPixels(10));
   content_->SetBounds(content_bounds);
 
   // The omnibox view bounds are in physical pixels.
   omnibox_view_->SetBounds(bounds_in_physical_pixels);
 }
 
 }  // namespace mandoline