Revert "Add a Finch experiment V8HugeMaxOldGenerationSizefor V8 heap size increase"

This reverts commit 23971187.

Reason for revert: <Waiting for the other V8 change rolling up into Chrome build. Revert this CL for now.>

Original change's description:
> Add a Finch experiment V8HugeMaxOldGenerationSizefor V8 heap size increase
> 
> Increase max_old_space_size to 4 GB based on availability of physical memory.
> The purpose of this finch is to support web apps that require more heap space
> for their data sets
> 
> Bug:958974
> 
> Change-Id: I7f6bb9e69a306331242434cfc03acd68ad32333d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1592792
> Reviewed-by: Zhenyao Mo <zmo@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Brian White <bcwhite@chromium.org>
> Commit-Queue: Maggie Chen <magchen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#656851}

TBR=sky@chromium.org,zmo@chromium.org,bcwhite@chromium.org,magchen@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 958974
Change-Id: I304ebbd702a000ee5f4a6d5956d3c61075144711
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1598484Reviewed-by: Maggie Chen <magchen@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657461}

gin/gin_features.cc

@@ -18,8 +18,4 @@ const base::Feature kV8FlushBytecode{"V8FlushBytecode",
 const base::Feature kV8MemoryReducerForSmallHeaps{
     "V8MemoryReducerForSmallHeaps", base::FEATURE_ENABLED_BY_DEFAULT};
 
-// Increase V8 heap size to 4GB if the physical memory is bigger than 16 GB.
-const base::Feature kV8HugeMaxOldGenerationSize{
-    "V8HugeMaxOldGenerationSize", base::FEATURE_DISABLED_BY_DEFAULT};
-
 }  // namespace features

gin/gin_features.h

@@ -13,7 +13,6 @@ namespace features {
 GIN_EXPORT extern const base::Feature kV8OptimizeJavascript;
 GIN_EXPORT extern const base::Feature kV8FlushBytecode;
 GIN_EXPORT extern const base::Feature kV8MemoryReducerForSmallHeaps;
-GIN_EXPORT extern const base::Feature kV8HugeMaxOldGenerationSize;
 
 }  // namespace features
 

gin/v8_initializer.cc

@@ -232,13 +232,6 @@ void V8Initializer::Initialize(IsolateHolder::ScriptMode mode) {
                                sizeof(no_memory_reducer) - 1);
   }
 
-  if (base::FeatureList::IsEnabled(features::kV8HugeMaxOldGenerationSize)) {
-    static const char huge_max_old_generation_size[] =
-        "--huge_max_old_generation_size";
-    v8::V8::SetFlagsFromString(huge_max_old_generation_size,
-                               sizeof(huge_max_old_generation_size) - 1);
-  }
-
   if (IsolateHolder::kStrictMode == mode) {
     static const char use_strict[] = "--use_strict";
     v8::V8::SetFlagsFromString(use_strict, sizeof(use_strict) - 1);

testing/variations/fieldtrial_testing_config.json

@@ -5419,25 +5419,6 @@
             ]
         }
     ],
-    "V8HugeMaxOldGenerationSize": [
-        {
-            "platforms": [
-                "android",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "V8HugeMaxOldGenerationSize"
-                    ]
-                }
-            ]
-        }
-    ],
     "V8Ignition": [
         {
             "platforms": [