external/chromium: convert LOCAL_MODULE_PATH to LOCAL_MODULE_RELATIVE_PATH

LOCAL_MODULE_PATH doesn't work for multiarch builds, replace it
with LOCAL_MODULE_RELATIVE_PATH.

Change-Id: I4e4ceec61d026bbe74ba604554c06104bde42e5e
Merge "external/chromium: convert LOCAL_MODULE_PATH to LOCAL_MODULE_RELATIVE_PATH"
Merge branch 'master' of https://android.googlesource.com/platform/external/chromium into HEAD