Re-enable TCMalloc on Linux.

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 185 matching lines @@
     # sandbox the zygote process and, thus, all renderer processes.
     'linux_sandbox_path%': '',
 
     # Set this to true to enable SELinux support.
     'selinux%': 0,
 
     # Strip the binary after dumping symbols.
     'linux_strip_binary%': 0,
 
     # Enable TCMalloc.
-    'linux_use_tcmalloc%': 0,
+    'linux_use_tcmalloc%': 1,
 
     # Disable TCMalloc's debugallocation.
     'linux_use_debugallocation%': 0,
 
     # Disable TCMalloc's heapchecker.
     'linux_use_heapchecker%': 0,
 
     # Set to 1 to turn on seccomp sandbox by default.
     # (Note: this is ignored for official builds.)
     'linux_use_seccomp_sandbox%': 0,
@@ skipping 1062 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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