Remove -rdynamic from the linux debug build.

build/common.gypi

 # Copyright (c) 2010 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
     # .gyp files or targets should set chromium_code to 1 if they build
@@ skipping 907 matching lines @@
             },
             'defines': [
               '_DEBUG',
             ],
             'cflags': [
               '-O>(debug_optimize)',
               '-g',
               # One can use '-gstabs' to enable building the debugging
               # information in STABS format for breakpad's dumpsyms.
             ],
-            'ldflags': [
-              '-rdynamic',  # Allows backtrace to resolve symbols.
-            ],
           },
           'Release_Base': {
             'variables': {
               'release_optimize%': '2',
               # Binaries become big and gold is unable to perform GC
               # and remove unused sections for some of test targets
               # on 32 bit platform.
               # (This is currently observed only in chromeos valgrind bots)
               # The following flag is to disable --gc-sections linker
               # option for these bots.
@@ skipping 499 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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