Add use_allocator instead of linux_use_tcmalloc to switch the allocator.

ui/app_list/app_list.gyp

Index: ui/app_list/app_list.gyp
diff --git a/ui/app_list/app_list.gyp b/ui/app_list/app_list.gyp
index 91e5bf4a3c4dd7b46b616d6f3fc2f21b4fc940b4..a0ba9133cd3a3a3e73573ee32b4dba15f3e4bcd3 100644
--- a/ui/app_list/app_list.gyp
+++ b/ui/app_list/app_list.gyp
@@ -259,7 +259,8 @@
           ],
         }],
         # See http://crbug.com/162998#c4 for why this is needed.
-        ['OS=="linux" and linux_use_tcmalloc==1', {
+        # TODO(dmikurube): Kill linux_use_tcmalloc. http://crbug.com/345554
+        ['OS=="linux" and ((use_allocator!="none" and use_allocator!="see_use_tcmalloc") or (use_allocator=="see_use_tcmalloc" and linux_use_tcmalloc==1))', {
           'dependencies': [
             '../../base/allocator/allocator.gyp:allocator',
             # The following two dependencies provide the missing