Enable debugallocation by default (try 3 or so).

base/allocator/allocator.gyp

Index: base/allocator/allocator.gyp
diff --git a/base/allocator/allocator.gyp b/base/allocator/allocator.gyp
index f5bda7370c1b5decbe6fa05eb5a77f51a5fc9543..46861ecdb8d0ccfefdaea2b9b0960c297c92585a 100644
--- a/base/allocator/allocator.gyp
+++ b/base/allocator/allocator.gyp
@@ -312,10 +312,11 @@
             # Provide a way to force disable debugallocation in Debug builds,
             # e.g. for profiling (it's more rare to profile Debug builds,
             # but people sometimes need to do that).
-            'disable_debugallocation%': 1,
+            'disable_debugallocation%': 0,
           },
           'conditions': [
-            ['disable_debugallocation==0', {
+            # TODO(phajdan.jr): Also enable on Windows.
+            ['disable_debugallocation==0 and OS!="win"', {
               'defines': [
                 # Use debugallocation for Debug builds to catch problems early
                 # and cleanly, http://crbug.com/30715 .