Make RenderView not have to know about how PhishingClassifierDelegate.

chrome/renderer/safe_browsing/phishing_thumbnailer.cc

 // Copyright (c) 2010 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 "chrome/renderer/safe_browsing/phishing_thumbnailer.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/time.h"
 #include "chrome/renderer/render_view.h"
@@ skipping 10 matching lines @@
 using WebKit::WebRect;
 using WebKit::WebSize;
 using WebKit::WebView;
 
 namespace safe_browsing {
 
 SkBitmap GrabPhishingThumbnail(RenderView* render_view,
                                const gfx::Size& view_size,
                                const gfx::Size& thumbnail_size) {
   if (!render_view || !render_view->webview()) {
-    NOTREACHED();
-    return SkBitmap();
+    return SkBitmap();  // The WebView is going away.
   }
   WebView* view = render_view->webview();
   base::TimeTicks beginning_time = base::TimeTicks::Now();
   skia::PlatformCanvas canvas;
   if (!canvas.initialize(view_size.width(), view_size.height(), true)) {
     return SkBitmap();
   }
 
   // Make sure we are not using any zoom when we take the snapshot.  We will
   // restore the previous zoom level after the snapshot is taken.
@@ skipping 30 matching lines @@
   view->mainFrame()->setCanHaveScrollbars(
       render_view->should_display_scrollbars(old_size.width, old_size.height));
   view->resize(old_size);
 
   UMA_HISTOGRAM_TIMES("SBClientPhishing.GrabPhishingThumbnail",
                       base::TimeTicks::Now() - beginning_time);
   return thumbnail;
 }
 
 }  // namespace safe_browsing