Uniformly escape shell arguments.

Arguments with embedded spaces need to be wrapped in quotes, which
changes the overall escaping strategy.  Instead of mixing the two
strategies, just always wrap arguments in quotes.

(cherry-pick of 824d10657a62201c6ee4f5e271e944322ebbdb75.)

Bug: 15479704
Change-Id: I03eacfa1bd6c220d4ec6617b825ebb0c43c7221e
1 file changed