Only add a WebKit dependency for shared library build.

content/content_common.gypi

Index: content/content_common.gypi
===================================================================
--- content/content_common.gypi	(revision 81617)
+++ content/content_common.gypi	(working copy)
@@ -12,7 +12,6 @@
         '../skia/skia.gyp:skia',
         '../third_party/icu/icu.gyp:icuuc',
         '../third_party/npapi/npapi.gyp:npapi',
-        '../third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
         '../ui/gfx/gl/gl.gyp:gl',
         '../webkit/support/webkit_support.gyp:appcache',
         '../webkit/support/webkit_support.gyp:blob',
@@ -211,6 +210,16 @@
         'common/worker_messages.h',
       ],
       'conditions': [
+        # If we add this dependency on Windows, then chrome_frame.dll gets
+        # bloated with a lot of WebKit code unnecessairly.  So don't add a
+        # dependency for now, which is technically correct, but not necessary,
+        # until the code that's shared between common and chrome frame is split
+        # into a new target.
+        ['library=="shared_library"', {
+          'dependencies': [
+            '../third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
+          ],
+        }],
         ['OS=="win"', {
           'msvs_guid': '062E9260-304A-4657-A74C-0D3AA1A0A0A4',
           'sources': [