Pass ASan .saves file to strip when real .dSYM files are built.

build/common.gypi

Index: build/common.gypi
===================================================================
--- build/common.gypi	(revision 174391)
+++ build/common.gypi	(working copy)
@@ -3487,7 +3487,14 @@
                           # continue to insert -S when stripping even when
                           # additional flags are added with STRIPFLAGS.
                           'STRIPFLAGS': '-x',
-                        }],  # _type=="shared_library" or _type=="loadable_module"'
+                        }],  # _type=="shared_library" or _type=="loadable_module"
+                        ['_type=="executable"', {
+                          'conditions': [
+                            ['asan==1', {
+                              'STRIPFLAGS': '-s $(CHROMIUM_STRIP_SAVE_FILE)',
+                            }]
+                          ],
+                        }],  # _type=="executable" and asan==1
                       ],  # target_conditions
                     },  # xcode_settings
                   },  # configuration "Release"