Do not compress chrome.7z into chrome.packed.7z for developer (component) builds.

tools/win/copy-installer.bat

 ECHO OFF
 
 REM Copyright (c) 2012 The Chromium Authors. All rights reserved.
 REM Use of this source code is governed by a BSD-style license that can be
 REM found in the LICENSE file.
 
 REM Copies an installer and symbols from a build directory on a network share
 REM into the directory \[out|build]\[Debug|Release] on the current drive.
 REM
 REM Usage:
 REM   \\build.share\<path_to_checkout>\src\tools\win\copy-installer.bat
-REM 
+REM
 REM By default, the script will copy the Debug build in the tree, falling back
 REM to the Release build if one is not found.  Similarly, the ninja output
 REM directory is preferred over the devenv output directory.  Specify
 REM "out|build" and/or "Debug|Release" (case matters) on the command line in
 REM any order to influence selection.  The defaults for location and build type
 REM can also be overridden in a given build tree by creating a
 REM "copy-installer.cfg" file alongside the .gclient file that sets the OUTPUT
 REM and/or BUILDTYPE variables.
 REM
 REM Install Robocopy for superior performance on Windows XP if desired (it is
@@ skipping 20 matching lines @@
 IF "%OUTPUT%%BUILDTYPE%"=="" (
 ECHO No build found to copy.
 EXIT 1
 )
 
 SET FROM=%FROM%\%OUTPUT%\%BUILDTYPE%
 SET TO=\%OUTPUT%\%BUILDTYPE%
 
 REM Figure out what files to copy based on the component type (shared/static).
 IF EXIST "%FROM%\base.dll" (
-SET TOCOPY=*.pdb setup.exe setup.exe.manifest chrome.packed.7z *.dll
+SET TOCOPY=*.pdb setup.exe setup.exe.manifest chrome.7z *.dll
+SET ARCHIVETODELETE=chrome.packed.7z
 SET INSTALLER=setup.exe
 ) ELSE (
 SET TOCOPY=*.pdb mini_installer.exe
 SET INSTALLER=mini_installer.exe
 )
 
 CALL :_copyfiles
 
 REM incremental_chrome_dll=1 puts chrome_dll.pdb into the "initial" dir.
 IF EXIST "%FROM%\initial" (
 SET FROM=%FROM%\initial
 SET TOCOPY=*.pdb
 CALL :_copyfiles
 )
 
+REM Keeping the old chrome.packed.7z around could cause the new setup.exe to
+REM use it instead of the new chrome.7z, delete it to save developers from
+REM debugging nightmares!
+IF NOT "%ARCHIVETODELETE%"=="" (
+IF EXIST "%TO%\%ARCHIVETODELETE%" (
+ECHO Deleting old/deprecated %ARCHIVETODELETE%
+del /Q "%TO%\%ARCHIVETODELETE%"
+)
+)
+
 ECHO Ready to run/debug %TO%\%INSTALLER%.
 GOTO :EOF
 
 REM All labels henceforth are subroutines intended to be invoked by CALL.
 
 REM Canonicalize the first argument, returning it in RET.
 :_canonicalize
 SET RET=%~f1
 GOTO :EOF
 
@@ skipping 35 matching lines @@
 )
 GOTO :EOF
 
 REM We can't use a for..in..do loop since we have wildcards, so we make a call
 REM to this with the files to copy.
 :_xcopy_hack
 SHIFT
 IF "%0"=="" GOTO :EOF
 xcopy "%FROM%\%0" "%TO%" /d /y
 GOTO _xcopy_hack