[bfcache] Disable infinite timeout for bfcache test suite.

Currently kBackForwardCacheNoTimeEviction overrides specific setup in
the BackForwardCacheTest suite, where we want to preserve the previous
behavior. Explicitly override it at construction time.

Change-Id: I39cc378f2cc03bd798ef4306db6eeecfd8abc72b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1859790Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Arthur Hemery <ahemery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705996}

content/browser/frame_host/back_forward_cache_impl.cc

@@ -241,8 +241,16 @@ BackForwardCacheImpl::BackForwardCacheImpl()
 BackForwardCacheImpl::~BackForwardCacheImpl() = default;
 
 base::TimeDelta BackForwardCacheImpl::GetTimeToLiveInBackForwardCache() {
-  if (base::FeatureList::IsEnabled(kBackForwardCacheNoTimeEviction))
+  // We use the following order of priority if multiple values exist:
+  // - The programmatical value set in params. Used in specific tests.
+  // - Infinite if kBackForwardCacheNoTimeEviction is enabled.
+  // - Default value otherwise, kDefaultTimeToLiveInBackForwardCacheInSeconds.
+  if (base::FeatureList::IsEnabled(kBackForwardCacheNoTimeEviction) &&
+      GetFieldTrialParamValueByFeature(features::kBackForwardCache,
+                                       "TimeToLiveInBackForwardCacheInSeconds")
+          .empty()) {
     return base::TimeDelta::Max();
+  }
 
   return base::TimeDelta::FromSeconds(base::GetFieldTrialParamByFeatureAsInt(
       features::kBackForwardCache, "TimeToLiveInBackForwardCacheInSeconds",