Remove -Wno-deprecated-warnings from cflags for clang

third-party libraries that use auto_ptr or other deprecated APIs
should either define this locally or be updated.

BUG=324299
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/96833003

git-svn-id: http://src.chromium.org/svn/trunk/src/build@237971 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -3277,9 +3277,6 @@
               # code generated by flex (used in angle) contains that keyword.
               # http://crbug.com/255186
               '-Wno-deprecated-register',
-
-              # This warns about auto_ptr<>, used in third-party code.
-              '-Wno-deprecated-declarations',
             ],
             'cflags!': [
               # Clang doesn't seem to know know this flag.
@@ -4001,9 +3998,6 @@
                 # code generated by flex (used in angle) contains that keyword.
                 # http://crbug.com/255186
                 '-Wno-deprecated-register',
-
-                # This warns about auto_ptr<>, used in third-party code.
-                '-Wno-deprecated-declarations',
               ],
             }],
             ['clang==1 and clang_use_chrome_plugins==1', {