Cleanup: Simplify enable_plugin gyp flag and remove an obsolete TODO.

Review URL: https://codereview.chromium.org/242303003

git-svn-id: http://src.chromium.org/svn/trunk/src/build@265211 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -495,11 +495,6 @@
       # Enable plug-in installation by default.
       'enable_plugin_installation%': 1,
 
-      # Enable PPAPI and NPAPI by default.
-      # TODO(nileshagrawal): Make this flag enable/disable NPAPI as well
-      # as PPAPI; see crbug.com/162667.
-      'enable_plugins%': 1,
-
       # Specifies whether to use canvas_skia.cc in place of platform
       # specific implementations of gfx::Canvas. Affects text drawing in the
       # Chrome UI.
@@ -720,6 +715,7 @@
           'enable_plugin_installation%': 1,
         }],
 
+        # Whether PPAPI is enabled.
         ['OS=="android" or OS=="ios" or embedded==1', {
           'enable_plugins%': 0,
         }, {