Revert "Changes to include fast app reinstall in chrome://flags."

This reverts commit 5a2d4909.

Reason for revert: Suspect for failing unit_tests, https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/linux-chromeos-rel/20476

Original change's description:
> Changes to include fast app reinstall in chrome://flags.
> 
> Bug: 911427
> Change-Id: Ic33fd7507d36d0e847598722067ce64802718f9e
> Reviewed-on: https://chromium-review.googlesource.com/c/1484391
> Reviewed-by: Jenny Zhang <jennyz@chromium.org>
> Commit-Queue: Rob Schonberger <robsc@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#634884}

TBR=jennyz@chromium.org,robsc@chromium.org

Change-Id: I69637a4f4064131eedf57f18f9a27769cf70a4f9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 911427
Reviewed-on: https://chromium-review.googlesource.com/c/1484587Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634907}

chrome/browser/about_flags.cc

@@ -3815,10 +3815,6 @@ const FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kEnableZeroStateSuggestionsName,
      flag_descriptions::kEnableZeroStateSuggestionsDescription, kOsCrOS,
      FEATURE_VALUE_TYPE(app_list_features::kEnableZeroStateSuggestions)},
-    {"enable-zero-state-app-reinstall-suggestions",
-     flag_descriptions::kEnableAppReinstallZeroStateName,
-     flag_descriptions::kEnableAppReinstallZeroStateDescription, kOsCrOS,
-     FEATURE_VALUE_TYPE(app_list_features::kEnableAppReinstallZeroState)},
 #endif  // OS_CHROMEOS
 
     {"enable-bloated-renderer-detection",

chrome/browser/flag_descriptions.cc

@@ -3524,12 +3524,6 @@ const char kWakeOnPacketsName[] = "Wake On Packets";
 const char kWakeOnPacketsDescription[] =
     "Enables waking the device based on the receipt of some network packets.";
 
-const char kEnableAppReinstallZeroStateName[] =
-    "Enable Zero State App Reinstall Suggestions.";
-const char kEnableAppReinstallZeroStateDescription[] =
-    "Enable Zero State App Reinstall Suggestions feature in launcher, which "
-    "will show app reinstall recommendations at end of zero state list.";
-
 #endif  // defined(OS_CHROMEOS)
 
 // Random platform combinations -----------------------------------------------

chrome/browser/flag_descriptions.h

@@ -2108,9 +2108,6 @@ extern const char kVoiceInputDescription[];
 extern const char kWakeOnPacketsName[];
 extern const char kWakeOnPacketsDescription[];
 
-extern const char kEnableAppReinstallZeroStateName[];
-extern const char kEnableAppReinstallZeroStateDescription[];
-
 #endif  // #if defined(OS_CHROMEOS)
 
 // Random platform combinations -----------------------------------------------