[Sharesheet] Turn on flags to enable sharesheet by default.

This CL turns on the kIntentHandlingSharing and kSharesheet flags to
enable sharesheet feature by default.

BUG=1097623

Change-Id: Idff4e37934fb730b7f83b86206d555a8c049f12e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2460206
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816071}

chrome/common/chrome_features.cc

@@ -490,7 +490,7 @@ const base::Feature kInstallableAmbientBadgeInfoBar{
 #if !defined(OS_ANDROID)
 // Support sharing in Chrome OS intent handling.
 const base::Feature kIntentHandlingSharing{"IntentHandlingSharing",
-                                           base::FEATURE_DISABLED_BY_DEFAULT};
+                                           base::FEATURE_ENABLED_BY_DEFAULT};
 // Allow user to have preference for PWA in the intent picker.
 const base::Feature kIntentPickerPWAPersistence{
     "IntentPickerPWAPersistence", base::FEATURE_DISABLED_BY_DEFAULT};
@@ -700,8 +700,7 @@ const base::Feature kSecurityKeyAttestationPrompt{
     "SecurityKeyAttestationPrompt", base::FEATURE_ENABLED_BY_DEFAULT};
 
 #if defined(OS_CHROMEOS)
-const base::Feature kSharesheet{"Sharesheet",
-                                base::FEATURE_DISABLED_BY_DEFAULT};
+const base::Feature kSharesheet{"Sharesheet", base::FEATURE_ENABLED_BY_DEFAULT};
 #endif
 
 #if defined(OS_MAC)