Revert "Android: Enable C99 mode instead of C89 (default)."

webrtc/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # TODO(kjellander): Rebase this to webrtc/build/common.gypi changes after r6330.
 
@@ skipping 136 matching lines @@
       defines += [ "MIPS_DSP_R1_LE" ]
     } else if (mips_dsp_rev == 2) {
       defines += [
         "MIPS_DSP_R1_LE",
         "MIPS_DSP_R2_LE",
       ]
     }
   }
 
   if (is_android && !is_clang) {
+    # The Android NDK doesn"t provide optimized versions of these
+    # functions. Ensure they are disabled for all compilers.
     cflags += [
-      # The Android NDK doesn't provide optimized versions of these
-      # functions. Ensure they are disabled for all compilers.
       "-fno-builtin-cos",
       "-fno-builtin-sin",
       "-fno-builtin-cosf",
       "-fno-builtin-sinf",
     ]
-    cflags_c = [
-      # Use C99 mode instead of C89 (default).
-      "-std=c99",
-    ]
   }
 }
 
 source_set("webrtc") {
   sources = [
     "call.h",
     "config.h",
     "frame_callback.h",
     "transport.h",
   ]
@@ skipping 95 matching lines @@
   if (rtc_enable_protobuf) {
     defines += [ "ENABLE_RTC_EVENT_LOG" ]
     deps += [ ":rtc_event_log_proto" ]
   }
   if (is_clang && !is_nacl) {
     # Suppress warnings from Chrome's Clang plugins.
     # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 }