WebUI TaskManager: Turn it on-by-default on Win/Mac/Linux

Enable WebUI task manager for all platforms in r18, reverting r112133 ("WebUI TaskManager: Turn it off-by-default on Win/Mac/Linux").

BUG=97429
TEST=manual on linux
TBR=yoshiki@chromium.org

Review URL: http://codereview.chromium.org/8890065

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113779 0039d316-1c4b-4281-b951-d872f2087c98

build/common.gypi

@@ -134,8 +134,8 @@
       # Disable file manager component extension by default.
       'file_manager_extension%': 0,
 
-      # Disable WebUI TaskManager by default.
-      'webui_task_manager%': 0,
+      # Enable WebUI TaskManager by default.
+      'webui_task_manager%': 1,
 
       # Python version.
       'python_ver%': '2.6',
@@ -326,7 +326,7 @@
           'file_manager_extension%': 0,
         }],
 
-        # Enable WebUI TaskManager only on Chrome OS or Aura.
+        # Enable WebUI TaskManager always on Chrome OS or Aura.
         ['chromeos==1 or use_aura==1', {
           'webui_task_manager%': 1,
         }],