Fix Android build break when is_chrome_branded = true.

Some constexpr static class members still require definitions in C++14 but
it is not clear why this build break occurred on Android only.

Change-Id: I3e0d04d765f02ce37db2f7b4df90bb4d85fcab6d

BUG: 1030716
Change-Id: I3e0d04d765f02ce37db2f7b4df90bb4d85fcab6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1950749Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721601}

chrome/browser/component_updater/recovery_improved_component_installer.cc

@@ -34,6 +34,10 @@
 
 namespace component_updater {
 
+constexpr base::TaskTraits RecoveryComponentActionHandler::kTaskTraits;
+constexpr base::TaskTraits
+    RecoveryComponentActionHandler::kTaskTraitsRunCommand;
+
 RecoveryComponentActionHandler::RecoveryComponentActionHandler(
     const std::vector<uint8_t>& key_hash,
     crx_file::VerifierFormat verifier_format)