Add a Repack tool to scons. This is used to compile linux resources

net/net_resources.scons

Index: net/net_resources.scons
diff --git a/net/net_resources.scons b/net/net_resources.scons
index 1bc534ed4c6aeba43d6761cc6fbefebea865c049..1f279e84a989722d2f694678c706144cee194902 100644
--- a/net/net_resources.scons
+++ b/net/net_resources.scons
@@ -7,7 +7,6 @@ Configuration for building the net_resources.rc resources.
 """
 
 import os
-import sys
 
 Import('env')
 
@@ -24,8 +23,6 @@ tld_names_clean = env.Command(
     input_files,
     '${SOURCES[1]} ${SOURCES[0]} $TARGET')
 
-sys.path.append(env.Dir('$CHROME_SRC_DIR/tools/grit').abspath)
-env.Tool('scons', toolpath=[env.Dir('$CHROME_SRC_DIR/tools/grit/grit')])
 # This dummy target is used to tell the emitter where to put the target files.
 generated = env.GRIT('$TARGET_ROOT/grit_derived_sources/dummy_net_res',
                      ['base/net_resources.grd'] + tld_names_clean)