Roll third_party/inspector_protocol to 715b83a3cfb45ce6c67b6c6fdd2c16391b5db896

This roll includes:
  - [inspector_protocol] always use weak pointer in DispatcherImpl::{command.name} [1]

[1] https://codereview.chromium.org/2545613002/

BUG=chromium:668358
TBR=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2541253002
Cr-Commit-Position: refs/heads/master@{#41402}

third_party/inspector_protocol/README.v8

@@ -2,7 +2,7 @@ Name: inspector protocol
 Short Name: inspector_protocol
 URL: https://chromium.googlesource.com/deps/inspector_protocol/
 Version: 0
-Revision: 4ad35c45aca9834b67ec2cb152c816ea1b7ceb48
+Revision: 715b83a3cfb45ce6c67b6c6fdd2c16391b5db896
 License: BSD
 License File: LICENSE
 Security Critical: no
@@ -14,4 +14,3 @@ description.
 Local modifications:
 - This only includes the lib/ and templates/ directories, scripts, build
   and the LICENSE files.
-- FallbackThrough support is removed for async methods.

third_party/inspector_protocol/templates/TypeBuilder_cpp.template

@@ -355,6 +355,7 @@ DispatchResponse::Status DispatcherImpl::{{command.name}}(int callId, std::uniqu
       {% endif %}
     return response.status();
     {% else %}
+    std::unique_ptr<DispatcherBase::WeakPtr> weak = weakPtr();
     std::unique_ptr<{{command.name | to_title_case}}CallbackImpl> callback(new {{command.name | to_title_case}}CallbackImpl(weakPtr(), callId, nextCallbackId()));
     m_backend->{{command.name | to_method_case}}(
       {%- for property in command.parameters -%}
@@ -367,7 +368,7 @@ DispatchResponse::Status DispatcherImpl::{{command.name}}(int callId, std::uniqu
       {%- endfor -%}
         {%- if command.parameters -%}, {% endif -%}
         std::move(callback));
-    return DispatchResponse::kAsync;
+    return (weak->get() && weak->get()->lastCallbackFallThrough()) ? DispatchResponse::kFallThrough : DispatchResponse::kAsync;
     {% endif %}
 }
   {% endfor %}