Fix build failure from previous change.

build/common.gypi

 # Copyright (c) 2010 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
     # .gyp files or targets should set chromium_code to 1 if they build
     # Chromium-specific code, as opposed to external code.  This variable is
     # used to control such things as the set of warnings to enable, and
     # whether warnings are treated as errors.
     'chromium_code%': 0,
 
+    'internal_pdf%': 0,
+
     # Variables expected to be overriden on the GYP command line (-D) or by
     # ~/.gyp/include.gypi.
 
     # Putting a variables dict inside another variables dict looks kind of
     # weird.  This is done so that "branding" and "buildtype" are defined as
     # variables within the outer variables dict here.  This is necessary
     # to get these variables defined for the conditions within this variables
     # dict that operate on these variables.
     'variables': {
       # Override branding to select the desired branding flavor.
@@ skipping 1351 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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 # indent-tabs-mode:nil
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