Load pdf library on all platforms.

Added RenderPDFPageToBitmap signature.

Call ChromeContentUtilityClient::PreSandboxStartup for Zygote. It does not real additional work. Zygote already loads pdf and initialize MediaLibrary for renderer inside content/, pdf is just to hard to access from Utility. ServiceDiscoveryMessageHandler::PreSandboxStartup does nothing for POSIX.

BUG=318373

Review URL: https://codereview.chromium.org/70083006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236212 0039d316-1c4b-4281-b951-d872f2087c98
[net/dns] Fix check failure in AddressSorterPosix.

If GetLocalAddress fails, |src| is empty so ToStringWithoutPort will
CHECK. The actual intent is to log |dest|.

BUG=321438

Review URL: https://codereview.chromium.org/76913003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236213 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236212
SVN changes up to revision 236213