refactoring fix-gclient -> fix-depot_tools

Common/3dParty/v8/fetch.bat

@@ -5,7 +5,7 @@ if exist "depot_tools" (
 	echo "depot_tools already fetched"
 ) else (
 	call git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
-	call powershell -File .\fix-gclient.ps1
+	call powershell -File .\fix-depot_tools.ps1
 )
 
 SET PATH=%SCRIPTPATH%depot_tools;%SCRIPTPATH%depot_tools\python276_bin;%PATH%