[swarming] Port updated version of isolate_driver.py

This version of the isolate_driver includes a feature
that automatically derives shared libraries for inclusion.

This is needed for GN as the shared library location is
different compared to gyp and having different configs
would be tedious.

This also removes the shared-library-specific configs as
they are no longer needed with the new driver.

BUG=chromium:474921

Review-Url: https://codereview.chromium.org/2123223002
Cr-Commit-Position: refs/heads/master@{#37555}

src/base.isolate

@@ -22,22 +22,6 @@
         ],
       },
     }],
-    ['OS=="linux" and component=="shared_library" and target_arch=="ia32"', {
-      'variables': {
-        'files': [
-          '<(PRODUCT_DIR)/lib/',
-        ],
-      },
-    }],
-    ['OS=="win" and component=="shared_library"', {
-      'variables': {
-        'files': [
-          '<(PRODUCT_DIR)/icui18n.dll',
-          '<(PRODUCT_DIR)/icuuc.dll',
-          '<(PRODUCT_DIR)/v8.dll',
-        ],
-      },
-    }],
     ['OS=="mac" and asan==1', {
       'variables': {
         'files': [