Disable library dependencies check by default when build instrumented libraries.

BUG=313751
R=glider@chromium.org
TBR=cpu@chromium.org

Installing all library dependencies using "apt-get build-dep"
is not nesessary to build libraries. So, dependency checking will be shut down
by default. All really nesessary dependencies will be added to
"install-build-deps.sh".

Review URL: https://codereview.chromium.org/113443003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241311 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241311