Revert of [DevTools] Check request_id in DevToolsUIBindings::IndexPath

Revert of [DevTools] Check request_id in DevToolsUIBindings::IndexPath (patchset #1 id:1 of https://codereview.chromium.org/951953002/)

Reason for revert:
Speculative revert: http://build.chromium.org/p/chromium.mac/builders/Mac10.6%20Tests/builds/4683/steps/browser_tests%20on%20Mac-10.6/logs/DevToolsSanityTest.TestReattachAfterCrash became very flaky on Mac OS X 10.6 about when this patch was introduced. This is the only devtools change near to the start of the flakiness.

The errors are:
DevToolsSanityTest.TestReattachAfterCrash (run #1):
[ RUN      ] DevToolsSanityTest.TestReattachAfterCrash
[32422:28675:0224/105826:WARNING:data_reduction_proxy_config.cc(211)] SPDY proxy OFF at startup
HTTP server started on http://127.0.0.1:64960...
sending server_data: {"host": "127.0.0.1", "port": 64960} (36 bytes)
[32427:9479:0224/105828:WARNING:channel.cc(547)] Failed to send message to ack remove remote endpoint (local ID 1, remote ID 1)
[32427:9479:0224/105828:WARNING:channel.cc(547)] Failed to send message to ack remove remote endpoint (local ID 2147483648, remote ID 2

Original issue's description:
> [DevTools] Check request_id in DevToolsUIBindings::IndexPath
>
> If request_id is reused before the previous job with the same id is finished the old job won't be stopped in ~DevToolsUIBindings.
>
> BUG=
>
> Committed: https://crrev.com/88ac3ce8fa6463e5f04d4b3e7e2327e2ec1b3a19
> Cr-Commit-Position: refs/heads/master@{#317799}

TBR=dgozman@chromium.org,vkuzkokov@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/012bebf20cabd5a81179a185b87bd75f632edb66
Cr-Commit-Position: refs/heads/master@{#318019}

[phoglund_chromium, 2015-02-25 10:19:37]

Created Revert of [DevTools] Check request_id in DevToolsUIBindings::IndexPath

[commit-bot: I haz the power, 2015-02-25 10:20:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/956873002/1

[commit-bot: I haz the power, 2015-02-25 10:21:05]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-02-25 10:21:06]

Failed to apply patch for chrome/browser/devtools/devtools_ui_bindings.cc:
While running git apply --index -3 -p1;
  error: patch failed: chrome/browser/devtools/devtools_ui_bindings.cc:573
  Falling back to three-way merge...
  Applied patch to 'chrome/browser/devtools/devtools_ui_bindings.cc' with
conflicts.
  U chrome/browser/devtools/devtools_ui_bindings.cc

Patch:       chrome/browser/devtools/devtools_ui_bindings.cc
Index: chrome/browser/devtools/devtools_ui_bindings.cc
diff --git a/chrome/browser/devtools/devtools_ui_bindings.cc
b/chrome/browser/devtools/devtools_ui_bindings.cc
index
e45257429516ef75a2124ccf6c91fc24b8282c0b..982842db17ca0f9d74691d4c97b0eef1240385c2
100644
--- a/chrome/browser/devtools/devtools_ui_bindings.cc
+++ b/chrome/browser/devtools/devtools_ui_bindings.cc
@@ -573,8 +573,6 @@
     IndexingDone(request_id, file_system_path);
     return;
   }
-  if (indexing_jobs_.count(request_id) != 0)
-    return;
   indexing_jobs_[request_id] =
       scoped_refptr<DevToolsFileSystemIndexer::FileSystemIndexingJob>(
           file_system_indexer_->IndexPath(

[commit-bot: I haz the power, 2015-02-25 10:21:28]

The CQ bit was unchecked by commit-bot@chromium.org

[phoglund_chromium, 2015-02-25 10:42:54]

The CQ bit was checked by phoglund@chromium.org

[commit-bot: I haz the power, 2015-02-25 10:43:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/956873002/40001

[commit-bot: I haz the power, 2015-02-25 10:44:20]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2015-02-25 10:45:15]

Patchset 2 (id:??) landed as
https://crrev.com/012bebf20cabd5a81179a185b87bd75f632edb66
Cr-Commit-Position: refs/heads/master@{#318019}

[vkuzkokov, 2015-02-25 10:46:06]

On 2015/02/25 10:44:20, I haz the power (commit-bot) wrote:
> Committed patchset #2 (id:40001)

FYI, first failure happened before the original CL landed.
http://build.chromium.org/p/chromium.mac/builders/Mac10.6%20Tests/builds/4677

[phoglund_chromium, 2015-02-25 11:09:54]

A revert of this CL (patchset #2 id:40001) has been created in
https://codereview.chromium.org/957623003/ by phoglund@chromium.org.

The reason for reverting is: Turns out the revert was incorrect (the error even
started happening a couple builds before this patch)..