Roll breakpad to r897 to eliminate UnspecifiedStackSignature crash dumps.

breakpad/breakpad.gyp

Index: breakpad/breakpad.gyp
diff --git a/breakpad/breakpad.gyp b/breakpad/breakpad.gyp
index 2774135cfdf4d43168a5897278ec53dda9e820e4..695932f2a4dbaaa5a8c4bf4dec2e4fd19dd66dea 100644
--- a/breakpad/breakpad.gyp
+++ b/breakpad/breakpad.gyp
@@ -282,6 +282,8 @@
                 'src/common/linux/elf_symbols_to_module.h',
                 'src/common/linux/file_id.cc',
                 'src/common/linux/file_id.h',
+                'src/common/linux/memory_mapped_file.cc',
+                'src/common/linux/memory_mapped_file.h',
                 'src/common/linux/guid_creator.h',
                 'src/common/module.cc',
                 'src/common/module.h',
@@ -336,6 +338,10 @@
             'src/common/linux/libcurl_wrapper.cc',
             'src/common/linux/libcurl_wrapper.h',
             'src/common/linux/linux_libc_support.h',
+            'src/common/linux/memory_mapped_file.cc',
+            'src/common/linux/memory_mapped_file.h',
+            'src/common/linux/safe_readlink.cc',
+            'src/common/linux/safe_readlink.h',
             'src/common/memory.h',
             'src/common/string_conversion.cc',
             'src/common/string_conversion.h',
@@ -441,6 +447,10 @@
             'src/tools/linux/md2core/minidump-2-core.cc'
           ],
 
+          'dependencies': [
+            'breakpad_client',
+          ],
+
           'include_dirs': [
             '..',
             'src',