Explicitly pass -Wno-unused-function to the targets that need it.

third_party/sqlite/sqlite.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'use_system_sqlite%': 0,
     'required_sqlite_version': '3.6.1',
   },
   'target_defaults': {
@@ skipping 99 matching lines @@
               },
             }],
           ],
         }, { # !use_system_sqlite
           'product_name': 'sqlite3',
           'type': 'static_library',
           'sources': [
             'amalgamation/sqlite3.h',
             'amalgamation/sqlite3.c',
           ],
+          'variables': {
+            'clang_warning_flags': [
+              # sqlite contains a few functions that are unused, at least on
+              # Windows with Chromium's sqlite patches applied
+              # (interiorCursorEOF fts3EvalDeferredPhrase
+              # fts3EvalSelectDeferred sqlite3Fts3InitHashTable
+              # sqlite3Fts3InitTok).
+              '-Wno-unused-function',
+            ],
+          },
           'include_dirs': [
             'amalgamation',
           ],
           'dependencies': [
             '../icu/icu.gyp:icui18n',
             '../icu/icu.gyp:icuuc',
           ],
           'direct_dependent_settings': {
             'include_dirs': [
               '.',
@@ skipping 79 matching lines @@
             'SQLITE_CORE',
           ],
           'sources': [
             'src/ext/icu/icu.c',
           ],
         },
       ],
     }],
   ],
 }