Remove the checks for component=shared_library.

The original CL is by maruel (see https://codereview.chromium.org/263823013/). I'm applying
his CL to icu52. Below is maruel's CL description.

This is not needed anymore, src/tools/isolate_driver.py parses the ninja files
to figure out the .so/.dylib/.dll needed automatically.

TBR=maruel@chromium.org
BUG=336439

Review URL: https://codereview.chromium.org/297763003

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/icu52@271774 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

icu.isolate

@@ -20,29 +20,5 @@
         ],
       },
     }],
-    ['OS=="linux" and component=="shared_library"', {
-      'variables': {
-        'isolate_dependency_tracked': [
-          '<(PRODUCT_DIR)/lib/libicui18n.so',
-          '<(PRODUCT_DIR)/lib/libicuuc.so',
-        ],
-      },
-    }],
-    ['OS=="mac" and component=="shared_library"', {
-      'variables': {
-        'isolate_dependency_tracked': [
-          '<(PRODUCT_DIR)/libicui18n.dylib',
-          '<(PRODUCT_DIR)/libicuuc.dylib',
-        ],
-      },
-    }],
-    ['OS=="win" and component=="shared_library"', {
-      'variables': {
-        'isolate_dependency_tracked': [
-          '<(PRODUCT_DIR)/icui18n.dll',
-          '<(PRODUCT_DIR)/icuuc.dll',
-        ],
-      },
-    }],
   ],
 }