Don't delete the manifest when linking on Windows in GN

build/toolchain/win/BUILD.gn

Index: build/toolchain/win/BUILD.gn
diff --git a/build/toolchain/win/BUILD.gn b/build/toolchain/win/BUILD.gn
index 04b36cf666e3c376d58d34b796d99b3a84d3599a..11ff2f25d2654d7833d98d9e03615eebe0e6cb96 100644
--- a/build/toolchain/win/BUILD.gn
+++ b/build/toolchain/win/BUILD.gn
@@ -59,14 +59,14 @@ toolchain("32") {
     rspfile_content = "\$in_newline \$libflags"
   }
   tool("solink") {
-    command = "cmd /c $python_path gyp-win-tool link-wrapper environment.x86 False link.exe /nologo \$implibflag /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp && $python_path gyp-win-tool manifest-wrapper environment.x86 cmd /c if exist \$dll.manifest del \$dll.manifest && $python_path gyp-win-tool manifest-wrapper environment.x86 mt.exe -nologo -manifest \$manifests -out:\$dll.manifest"
+    command = "cmd /c $python_path gyp-win-tool link-wrapper environment.x86 False link.exe /nologo \$implibflag /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp && $python_path gyp-win-tool manifest-wrapper environment.x86 mt.exe -nologo -manifest \$manifests -out:\$dll.manifest"
     description = "LINK(DLL) \$dll"
     restat = "1"
     rspfile = "\$dll.rsp"
     rspfile_content = "\$libs \$in_newline \$ldflags"
   }
   tool("link") {
-    command = "cmd /c $python_path gyp-win-tool link-wrapper environment.x86 False link.exe /nologo /OUT:\$out /PDB:\$out.pdb @\$out.rsp && $python_path gyp-win-tool manifest-wrapper environment.x86 cmd /c if exist \$out.manifest del \$out.manifest && $python_path gyp-win-tool manifest-wrapper environment.x86 mt.exe -nologo -manifest \$manifests -out:\$out.manifest"
+    command = "cmd /c $python_path gyp-win-tool link-wrapper environment.x86 False link.exe /nologo /OUT:\$out /PDB:\$out.pdb @\$out.rsp && $python_path gyp-win-tool manifest-wrapper environment.x86 mt.exe -nologo -manifest \$manifests -out:\$out.manifest"
     description = "LINK \$out"
     rspfile = "\$out.rsp"
     rspfile_content = "\$in_newline \$libs \$ldflags"
@@ -118,14 +118,14 @@ toolchain("64") {
     rspfile_content = "\$in_newline \$libflags"
   }
   tool("solink") {
-    command = "cmd /c $python_path gyp-win-tool link-wrapper environment.x64 False link.exe /nologo \$implibflag /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp && $python_path gyp-win-tool manifest-wrapper environment.x64 cmd /c if exist \$dll.manifest del \$dll.manifest && $python_path gyp-win-tool manifest-wrapper environment.x64 mt.exe -nologo -manifest \$manifests -out:\$dll.manifest"
+    command = "cmd /c $python_path gyp-win-tool link-wrapper environment.x64 False link.exe /nologo \$implibflag /DLL /OUT:\$dll /PDB:\$dll.pdb @\$dll.rsp && $python_path gyp-win-tool manifest-wrapper environment.x64 mt.exe -nologo -manifest \$manifests -out:\$dll.manifest"
     description = "LINK(DLL) \$dll"
     restat = "1"
     rspfile = "\$dll.rsp"
     rspfile_content = "\$libs \$in_newline \$ldflags"
   }
   tool("link") {
-    command = "cmd /c $python_path gyp-win-tool link-wrapper environment.x64 False link.exe /nologo /OUT:\$out /PDB:\$out.pdb @\$out.rsp && $python_path gyp-win-tool manifest-wrapper environment.x64 cmd /c if exist \$out.manifest del \$out.manifest && $python_path gyp-win-tool manifest-wrapper environment.x64 mt.exe -nologo -manifest \$manifests -out:\$out.manifest"
+    command = "cmd /c $python_path gyp-win-tool link-wrapper environment.x64 False link.exe /nologo /OUT:\$out /PDB:\$out.pdb @\$out.rsp && $python_path gyp-win-tool manifest-wrapper environment.x64 mt.exe -nologo -manifest \$manifests -out:\$out.manifest"
     description = "LINK \$out"
     rspfile = "\$out.rsp"
     rspfile_content = "\$in_newline \$libs \$ldflags"