Switch linux OpenSSL build to use custom openssl version

This allows us to test experimental library features, and to track a known openssl version.
Also bumps OpenSSL 65717:68738, to fix up the default CA root path in the reference library.

BUG=None
TEST=Still builds & runs!

Review URL: http://codereview.chromium.org/5625012

git-svn-id: http://src.chromium.org/svn/trunk/src/build@68749 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -320,7 +320,7 @@
     # Use GConf, the GNOME configuration system.
     'use_gconf%': 1,
 
-    # Use OpenSSL instead of NSS. Currently in development.
+    # Use OpenSSL instead of NSS. Under development: see http://crbug.com/62803
     'use_openssl%': 0,
 
     'conditions': [

linux/system.gyp

@@ -346,29 +346,6 @@
         ],
       },
     },
-    {
-      'target_name': 'openssl',
-      'type': 'settings',
-      'conditions': [
-        ['use_openssl==1', {
-          'direct_dependent_settings': {
-            'defines': [
-              # OpenSSL support is incomplete: http://crbug.com/62803.
-              # Defining USE_OPENSSL disables USE_NSS.
-              'USE_OPENSSL',
-            ],
-            'include_dirs': [
-              '<!@(<(pkg-config) --cflags openssl)',
-            ],
-          },
-          'link_settings': {
-            'libraries': [
-              '<!@(<(pkg-config) --libs-only-l openssl)',
-            ],
-          },
-        },],
-      ],
-    },
   ],
 }