build: Remove deprecated 'library' variable from common.gypi.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 5d600b0dba1802959c7f03dec810e7d8fcb0cddb..1e4fd116527e661bcc95dfb4a3ecd6d0621cf5b4 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -177,13 +177,6 @@
       'enable_web_intents%': 0,  # TODO(thakis): Remove, http://crbug.com/173194
       'buildtype%': '<(buildtype)',
 
-      # We used to provide a variable for changing how libraries were built.
-      # This variable remains until we can clean up all the users.
-      # This needs to be one nested variables dict in so that dependent
-      # gyp files can make use of it in their outer variables.  (Yikes!)
-      # http://code.google.com/p/chromium/issues/detail?id=83308
-      'library%': 'static_library',
-
       # Override branding to select the desired branding flavor.
       'branding%': 'Chromium',
 
@@ -662,7 +655,6 @@
     'buildtype%': '<(buildtype)',
     'target_arch%': '<(target_arch)',
     'host_arch%': '<(host_arch)',
-    'library%': 'static_library',
     'toolkit_views%': '<(toolkit_views)',
     'ui_compositor_image_transport%': '<(ui_compositor_image_transport)',
     'use_aura%': '<(use_aura)',