Make the "All" target depend on content

BUG=90443
TEST=none

Review URL: http://codereview.chromium.org/7621008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96354 0039d316-1c4b-4281-b951-d872f2087c98

build/all.gyp

@@ -13,6 +13,7 @@
         '../base/base.gyp:*',
         '../chrome/browser/sync/tools/sync_tools.gyp:*',
         '../chrome/chrome.gyp:*',
+        '../content/content.gyp:*',
         '../crypto/crypto.gyp:*',
         '../ui/ui.gyp:*',
         '../gpu/gpu.gyp:*',