Roll back cpython version on Linux.

Bug: 1208146
Change-Id: If692ee3073e41acf4da2cd271559b86987813937
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2896108
Auto-Submit: Brian Ryner <bryner@google.com>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Owners-Override: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>

bootstrap/manifest.txt

@@ -18,7 +18,9 @@
 $VerifiedPlatform windows-amd64 linux-amd64 mac-amd64
 
 @Subdir python
-infra/3pp/tools/cpython/${platform} version:2@2.7.18.chromium.35
+infra/3pp/tools/cpython/${os=mac,windows}-${arch} version:2@2.7.18.chromium.35
+# Linux version is held back for https://crbug.com/1208146
+infra/3pp/tools/cpython/${os=linux}-${arch} version:2.7.17.chromium.22
 
 @Subdir python3
 infra/3pp/tools/cpython3/${platform} version:2@3.8.10.chromium.17

bootstrap/manifest_bleeding_edge.txt

@@ -18,7 +18,9 @@
 $VerifiedPlatform windows-386 windows-amd64 linux-amd64 mac-amd64
 
 @Subdir python
-infra/3pp/tools/cpython/${platform} version:2@2.7.18.chromium.35
+infra/3pp/tools/cpython/${os=mac,windows}-${arch} version:2@2.7.18.chromium.35
+# Linux version is held back for https://crbug.com/1208146
+infra/3pp/tools/cpython/${os=linux}-${arch} version:2.7.17.chromium.22
 
 @Subdir python3
 infra/3pp/tools/cpython3/${platform} version:2@3.8.10.chromium.17