Remove 'global' user-data in favor of 'process' user-data.

base/debug/activity_tracker.cc

Index: base/debug/activity_tracker.cc
diff --git a/base/debug/activity_tracker.cc b/base/debug/activity_tracker.cc
index 5081c1c9d20b0da899481b81d9b0c347afe5cb96..7fc5748fa04247885fd762bdcdcb1e4706ac77dc 100644
--- a/base/debug/activity_tracker.cc
+++ b/base/debug/activity_tracker.cc
@@ -38,7 +38,6 @@ const int kMinStackDepth = 2;
 // pairs) globally or associated with ActivityData entries.
 const size_t kUserDataSize = 1 << 10;     // 1 KiB
 const size_t kProcessDataSize = 4 << 10;  // 4 KiB
-const size_t kGlobalDataSize = 16 << 10;  // 16 KiB
 const size_t kMaxUserDataNameLength =
     static_cast<size_t>(std::numeric_limits<uint8_t>::max());
 
@@ -1599,7 +1598,7 @@ void GlobalActivityTracker::RecordModuleInfo(const ModuleInfo& info) {
 void GlobalActivityTracker::RecordFieldTrial(const std::string& trial_name,
                                              StringPiece group_name) {
   const std::string key = std::string("FieldTrial.") + trial_name;
-  global_data_.SetString(key, group_name);
+  process_data_.SetString(key, group_name);
 }
 
 GlobalActivityTracker::GlobalActivityTracker(
@@ -1631,14 +1630,7 @@ GlobalActivityTracker::GlobalActivityTracker(
                         kTypeIdProcessDataRecord,
                         kProcessDataSize),
                     kProcessDataSize,
-                    process_id_),
-      global_data_(
-          allocator_->GetAsArray<char>(
-              allocator_->Allocate(kGlobalDataSize, kTypeIdGlobalDataRecord),
-              kTypeIdGlobalDataRecord,
-              kGlobalDataSize),
-          kGlobalDataSize,
-          process_id_) {
+                    process_id_) {
   DCHECK_NE(0, process_id_);
 
   // Ensure that there is no other global object and then make this one such.
@@ -1648,8 +1640,6 @@ GlobalActivityTracker::GlobalActivityTracker(
   // The data records must be iterable in order to be found by an analyzer.
   allocator_->MakeIterable(allocator_->GetAsReference(
       process_data_.GetBaseAddress(), kTypeIdProcessDataRecord));
-  allocator_->MakeIterable(allocator_->GetAsReference(
-      global_data_.GetBaseAddress(), kTypeIdGlobalDataRecord));
 
   // Note that this process has launched.
   SetProcessPhase(PROCESS_LAUNCHED);