Reland "linux: Enable Crashpad for content shell"

This is a reland of 9747ecdd3e60a23ab0ee22434aca4f7161f5d5f2

Original change's description:
> linux: Enable Crashpad for content shell
> 
> Bug: 942279
> Change-Id: I221431e352f11b40c3bc39bbcd8297b431dd8f0c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1763346
> Commit-Queue: Joshua Peraza <[email protected]>
> Reviewed-by: Peter Beverloo <[email protected]>
> Cr-Commit-Position: refs/heads/master@{#699880}

Bug: 942279
Change-Id: I7ced7adacbbe585f5ea47d00163b69953912b99d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847882
Reviewed-by: Jochen Eisinger <[email protected]>
Commit-Queue: Joshua Peraza <[email protected]>
Cr-Commit-Position: refs/heads/master@{#729810}
diff --git a/docs/testing/using_crashpad_with_content_shell.md b/docs/testing/using_crashpad_with_content_shell.md
index 4c08a9e..5152592a 100644
--- a/docs/testing/using_crashpad_with_content_shell.md
+++ b/docs/testing/using_crashpad_with_content_shell.md
@@ -16,12 +16,6 @@
 by default.
 ***
 
-*** note
-**Linux:** Add `use_debug_fission = true` to your [gn build
-arguments](https://gn.googlesource.com/gn/+/master/docs/quick_start.md) before
-building.
-***
-
 Then, create a directory where the crash dumps will be stored:
 
 * Linux/Mac:
@@ -67,13 +61,9 @@
 
 ## Retrieving the crash dump
 
-On Linux and Android, we first have to retrieve the crash dump. On Mac and
-Windows, this step can be skipped.
+On Android, we first have to retrieve the crash dump. On other platforms, this
+step can be skipped.
 
-* Linux:
-  ```bash
-  components/crash/content/tools/dmp2minidump.py /tmp/crashes/*.dmp /tmp/minidump
-  ```
 * Android:
   ```bash
   adb pull $(adb shell ls /data/data/org.chromium.content_shell_apk/cache/pending/*.dmp) /tmp/chromium-renderer-minidump.dmp