chrome: Add out-of-line copy ctors for complex classes.

chrome/browser/ui/webui/fileicon_source.cc

 // Copyright (c) 2012 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/browser/ui/webui/fileicon_source.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted_memory.h"
@@ skipping 64 matching lines @@
     else if (scale_factor && iter->first == kScaleFactor)
       webui::ParseScaleFactor(iter->second, scale_factor);
   }
 }
 
 }  // namespace
 
 FileIconSource::IconRequestDetails::IconRequestDetails() : scale_factor(1.0f) {
 }
 
+FileIconSource::IconRequestDetails::IconRequestDetails(
+    const IconRequestDetails& other) = default;
+
 FileIconSource::IconRequestDetails::~IconRequestDetails() {
 }
 
 FileIconSource::FileIconSource() {}
 
 FileIconSource::~FileIconSource() {}
 
 void FileIconSource::FetchFileIcon(
     const base::FilePath& path,
     float scale_factor,
@@ skipping 57 matching lines @@
             details.scale_factor).sk_bitmap(),
         false,
         &icon_data->data());
 
     details.callback.Run(icon_data.get());
   } else {
     // TODO(glen): send a dummy icon.
     details.callback.Run(NULL);
   }
 }