Build third-party code with -Wall, build chromium_code with -Wextra on Linux

third_party/ocmock/ocmock.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.
 
 {
   'targets': [
   ],
   'conditions': [
     ['OS=="mac" or OS=="ios"', {
       'targets' : [
@@ skipping 54 matching lines @@
             'OCMock/OCPartialMockObject.m',
             'OCMock/OCPartialMockRecorder.h',
             'OCMock/OCPartialMockRecorder.m',
             'OCMock/OCProtocolMockObject.h',
             'OCMock/OCProtocolMockObject.m',
             'OCMock/OCMockRecorder.h',
             'OCMock/OCMockRecorder.m',
             'OCMock/OCObserverMockObject.h',
             'OCMock/OCObserverMockObject.m',
           ],
+          'variables': {
+            'clang_warning_flags': [
+              # NSInvocation+OCMAdditions.m has some `- (void) foo; {...`
+              '-Wno-semicolon-before-method-body',
+            ],
+          },
         },
       ],
     }],
   ],
 }