Split NSSDecryptor out into platform specific files....

Split NSSDecryptor out into platform specific files.
This lets Linux not bother to initialize NSS in the same way as the rest, but instead use the NSS symbols linked into the library, thereby preventing the NSS_Shutdown related bugs.
BUG=http://crbug.com/13929
TEST=Case 1: Start chrome.  Use firefox import utility.  Browse to some https site.  Shouldn't crash.  Case 2: Start chrome.  Browse to some https site.  Use firefox import utility.  Continue browsing https sites.  Shouldn't crash.


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=21251

[kuchhal, 2009-07-22 00:16:14]

lgtm.

Instead of refactoring code would it have been possible to check if NSS was
already initialized on Linux and skip the init/shutdown step if so? Or may be
get rid of shutdown step altogether?

[willchan no longer on Chromium, 2009-07-22 00:23:12]

On 2009/07/22 00:16:14, kuchhal wrote:
> lgtm.
> 
> Instead of refactoring code would it have been possible to check if NSS was
> already initialized on Linux and skip the init/shutdown step if so? Or may be
> get rid of shutdown step altogether?

Yes, that was possible, although I ended up having to toss in a lot of #if
defined stuff around and it got messy.  firefox_imported_utils.h had defined
lots of the symbols which we needed to get from the nss headers, so it required
lots of #ifs to work around that and also elsewhere.  Also, this prevents linux
from compiling unnecessary code it doesn't need.