Turns on use_mojo=1 for linux.

chrome/installer/linux/common/installer.include

Index: chrome/installer/linux/common/installer.include
diff --git a/chrome/installer/linux/common/installer.include b/chrome/installer/linux/common/installer.include
index 9123a6e0c3579e402d3f6763291d9853d5a14b40..616c3c4fc4f00196bb5a49dbe6d2be815900d6fa 100644
--- a/chrome/installer/linux/common/installer.include
+++ b/chrome/installer/linux/common/installer.include
@@ -150,6 +150,12 @@ stage_install_common() {
   # ffmpeg libs
   install -m 644 -s "${BUILDDIR}/libffmpegsumo.so" "${STAGEDIR}/${INSTALLDIR}/"
 
+  install -m 755 -d "${STAGEDIR}/${INSTALLDIR}/lib/"
+
+  if [ -f "${BUILDDIR}/lib/libmojo_system.so" ]; then
+    install -m 644 -s "${BUILDDIR}/lib/libmojo_system.so" "${STAGEDIR}/${INSTALLDIR}/lib/"
+  fi
+
   # Widevine CDM.
   if [ -f "${BUILDDIR}/libwidevinecdmadapter.so" ]; then
     install -m 644 -s "${BUILDDIR}/libwidevinecdmadapter.so" "${STAGEDIR}/${INSTALLDIR}/"
@@ -172,7 +178,6 @@ stage_install_common() {
 
   # peerconnection shared library
   if [ -f "${BUILDDIR}/lib/libpeerconnection.so" ]; then
-    install -m 755 -d "${STAGEDIR}/${INSTALLDIR}/lib/"
     install -m 644 -s "${BUILDDIR}/lib/libpeerconnection.so" "${STAGEDIR}/${INSTALLDIR}/lib/"
   fi