Revert r292047: Replace compiling flag "-O3" with "-O2" to avoid a compiler bug that caused a crash

libsrtp.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_libsrtp%': 0,
   },
   'target_defaults': {
     'defines': [
@@ skipping 37 matching lines @@
       }],
       ['target_arch=="arm" or target_arch=="armv7" or target_arch=="arm64"', {
         'defines': [
           # TODO(leozwang): CPU_RISC doesn't work properly on android/arm
           # platform for unknown reasons, need to investigate the root cause
           # of it. CPU_RISC is used for optimization only, and CPU_CISC should
           # just work just fine, it has been tested on android/arm with srtp
           # test applications and libjingle.
           'CPU_CISC',
         ],
-        # TODO(jiayl): There seems to be a bug in the compiler that causes a
-        # crash (crbug/414919) using -O3. Remove this change once the compiler
-        # is fixed.
-        'cflags!': [
-          '-O3',
-        ],
-        'cflags': [
-          '-O2',
-        ],
       }],
       ['target_arch=="mipsel" or target_arch=="mips64el"', {
         'defines': [
           'CPU_RISC',
         ],
       }],
     ],
     'direct_dependent_settings': {
       'include_dirs': [
         './config',
@@ skipping 299 matching lines @@
           'link_settings': {
             'libraries': [
               '-lsrtp',
             ],
           },
         }, # target libsrtp
       ], # targets
     }],
   ],
 }