Remove dependency on allocator from 'content' targets

base/allocator/allocator.gyp

Index: base/allocator/allocator.gyp
diff --git a/base/allocator/allocator.gyp b/base/allocator/allocator.gyp
index ae93e9e03ca902fb8a10e66e1c2230f47a7d8ae7..87bf8d229d57625bd0e0861d17a2a589a8677fd7 100644
--- a/base/allocator/allocator.gyp
+++ b/base/allocator/allocator.gyp
@@ -227,6 +227,7 @@
             '<(tcmalloc_dir)/src/thread_cache.h',
 
             'debugallocation_shim.cc',
+            'tcmalloc_extension.cc',
           ],
           # sources! means that these are not compiled directly.
           'sources!': [
@@ -337,6 +338,8 @@
               '-Wl,-u_Z21InitialMallocHook_NewPKvj,-u_Z22InitialMallocHook_MMapPKvS0_jiiix,-u_Z22InitialMallocHook_SbrkPKvi',
               '-Wl,-u_Z21InitialMallocHook_NewPKvm,-u_Z22InitialMallocHook_MMapPKvS0_miiil,-u_Z22InitialMallocHook_SbrkPKvl',
               '-Wl,-u_ZN15HeapLeakChecker12IgnoreObjectEPKv,-u_ZN15HeapLeakChecker14UnIgnoreObjectEPKv',
+              # For InitializeAllocatorWeak function implementation for tcmalloc.
+              '-Wl,-u_ZN4base9allocator23InitializeAllocatorWeakEv',
           ]},
         }],
         [ 'use_vtable_verify==1', {