Roll breakpad and fix signal propagation for WebView crash handler

DEPS

 # This file is used to manage the dependencies of the Chromium src repo. It is
 # used by gclient to determine what version of each dependency to check out, and
 # where.
 #
 # For more information, please refer to the official documentation:
 #   https://sites.google.com/a/chromium.org/dev/developers/how-tos/get-the-code
 #
 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 #
@@ skipping 90 matching lines @@
 # If you need to add a new host, contact chrome infrastracture team.
 allowed_hosts = [
   'chromium.googlesource.com',
   'boringssl.googlesource.com',
   'pdfium.googlesource.com',
   'android.googlesource.com',
 ]
 
 deps = {
   'src/breakpad/src':
-   Var('chromium_git') + '/external/google-breakpad/src.git' + '@' + 'fa5a6b3449dbe77a107a891b96c0e47387302e2e', # from svn revision 1453
+   Var('chromium_git') + '/external/google-breakpad/src.git' + '@' + '9fcbe255a64d39295ad5f1f15c0b92db3da83c0f', # from svn revision 1454
 
   'src/buildtools':
    Var('chromium_git') + '/chromium/buildtools.git' + '@' +  Var('buildtools_revision'),
 
   'src/sdch/open-vcdiff':
    Var('chromium_git') + '/external/open-vcdiff.git' + '@' + '438f2a5be6d809bc21611a94cd37bfc8c28ceb33', # from svn revision 41
 
   'src/testing/gtest':
    Var('chromium_git') + '/external/googletest.git' + '@' + 'be1868139ffe0ccd0e8e3b37292b84c821d9c8ad', # from svn revision 704
 
@@ skipping 662 matching lines @@
     # corresponding .py files have already been deleted.
     'name': 'remove_stale_pyc_files',
     'pattern': 'src/tools/.*\\.py',
     'action': [
         'python',
         'src/tools/remove_stale_pyc_files.py',
         'src/tools',
     ],
   },
 ]