Delete chrome.7z archives in the current installation when doing an upgrade t...

chrome/installer/setup/install_worker.cc

 // Copyright (c) 2011 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.
 //
 // This file contains the definitions of the installer functions that build
 // the WorkItemList used to install the application.
 
 #include "chrome/installer/setup/install_worker.h"
 
 #include <shlobj.h>
@@ skipping 470 matching lines @@
                          scoped_ptr<Version>* current_version,
                          WorkItemList* install_list) {
   DCHECK(install_list);
 
   const FilePath& target_path = installer_state.target_path();
 
   // A temp directory that work items need and the actual install directory.
   install_list->AddCreateDirWorkItem(temp_path);
   install_list->AddCreateDirWorkItem(target_path);
 
+  if (current_version != NULL && current_version->get() != NULL) {
+    // Delete the archive from an existing install to save some disk space.  We
+    // make this an unconditional work item since there's no need to roll this
+    // back; if installation fails we'll be moved to the "-full" channel anyway.
+    FilePath old_installer_dir(
+        installer_state.GetInstallerDirectory(**current_version));
+    FilePath old_archive(old_installer_dir.Append(archive_path.BaseName()));
+    install_list->AddDeleteTreeWorkItem(old_archive, temp_path)
+        ->set_ignore_failure(true);
+  }
+
   // Delete any new_chrome.exe if present (we will end up creating a new one
   // if required) and then copy chrome.exe
-  FilePath new_chrome_exe(
-      target_path.Append(installer::kChromeNewExe));
+  FilePath new_chrome_exe(target_path.Append(installer::kChromeNewExe));
 
   install_list->AddDeleteTreeWorkItem(new_chrome_exe, temp_path);
   install_list->AddCopyTreeWorkItem(
       src_path.Append(installer::kChromeExe).value(),
       target_path.Append(installer::kChromeExe).value(),
       temp_path.value(), WorkItem::NEW_NAME_IF_IN_USE, new_chrome_exe.value());
 
   // Extra executable for 64 bit systems.
   // NOTE: We check for "not disabled" so that if the API call fails, we play it
   // safe and copy the executable anyway.
@@ skipping 474 matching lines @@
     } else {
       DCHECK(operation == REMOVE_COMMAND);
       work_item_list->AddDeleteRegKeyWorkItem(installer_state.root_key(),
                                               cmd_key)->set_log_message(
           "removing quick-enable-cf command");
     }
   }
 }
 
 }  // namespace installer