Update location to make it possible to find Valgrind

BUG=libyuv:676
NOTRY=True

Change-Id: Ic4d2fb48a818ffca8dcd71605761e7e04201ea21
Reviewed-on: https://chromium-review.googlesource.com/438330Reviewed-by: Henrik Kjellander <kjellander@chromium.org>
Commit-Queue: Henrik Kjellander <kjellander@chromium.org>

tools_libyuv/valgrind/libyuv_tests.sh

@@ -61,7 +61,7 @@ esac
 
 # For Libyuv, we'll use the locate_valgrind.sh script in Chromium's Valgrind
 # scripts dir to locate the Valgrind framework install
-CHROME_VALGRIND_SCRIPTS=$THISDIR/../valgrind
+CHROME_VALGRIND_SCRIPTS=$THISDIR/../../tools/valgrind
 
 if [ "$NEEDS_VALGRIND" == "1" ]
 then