Integrate module import verification with module loading verification.

BUG=

Review URL: https://codereview.chromium.org/27507010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232525 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232525
Simple Cache: Zero sparse range header on construction

Make sure we don't write uninitialized padding bytes to the Sparse File.
(We probably want to make these structs, and perhaps other Simple Cache
ones, packed in a future change, but that might require bumping the
cache version.)

BUG=314091

Review URL: https://codereview.chromium.org/49443003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232528 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232528
We want to see how many people open the final confirmation prompt to 'restore'/'keep' a dangerous download file.

BUG=305387
NOTRY=true

Review URL: https://codereview.chromium.org/53443003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232529 0039d316-1c4b-4281-b951-d872f2087c98
Port AudioPlaybackBenchmark to media_perftests.

BUG=310837

Review URL: https://codereview.chromium.org/53593002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232531 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232531