Removing a bunch of unused platform code.

Source/WTF/wtf/FastMalloc.cpp

Index: Source/WTF/wtf/FastMalloc.cpp
diff --git a/Source/WTF/wtf/FastMalloc.cpp b/Source/WTF/wtf/FastMalloc.cpp
index 41112ed8010ec3c83b0eec0606f5a4ee11cfdae7..ec72a280cc6e895804f570b8463b8f8e6cd6616b 100644
--- a/Source/WTF/wtf/FastMalloc.cpp
+++ b/Source/WTF/wtf/FastMalloc.cpp
@@ -78,7 +78,6 @@
 #include "FastMalloc.h"
 
 #include "Assertions.h"
-#include "CurrentTime.h"
 
 #include <limits>
 #if OS(WINDOWS)
@@ -103,16 +102,12 @@
 #endif
 
 // Harden the pointers stored in the TCMalloc linked lists
-#if COMPILER(GCC) && !PLATFORM(QT)
+#if COMPILER(GCC)
 #define ENABLE_TCMALLOC_HARDENING 1
 #endif
 
 // Use a background thread to periodically scavenge memory to release back to the system
-#if PLATFORM(IOS)
-#define USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY 0
-#else
 #define USE_BACKGROUND_THREAD_TO_SCAVENGE_MEMORY 1
-#endif
 
 #ifndef NDEBUG
 namespace WTF {
@@ -660,11 +655,7 @@ static const int kMaxFreeListLength = 256;
 
 // Lower and upper bounds on the per-thread cache sizes
 static const size_t kMinThreadCacheSize = kMaxSize * 2;
-#if PLATFORM(IOS)
-static const size_t kMaxThreadCacheSize = 512 * 1024;
-#else
 static const size_t kMaxThreadCacheSize = 2 << 20;
-#endif
 
 // Default bound on the total amount of thread caches
 static const size_t kDefaultOverallThreadCacheSize = 16 << 20;
@@ -2292,13 +2283,9 @@ void TCMalloc_PageHeap::IncrementalScavenge(Length n) {
   scavenge_counter_ -= n;
   if (scavenge_counter_ >= 0) return;  // Not yet time to scavenge
 
-#if PLATFORM(IOS)
-  static const size_t kDefaultReleaseDelay = 64;
-#else
   // If there is nothing to release, wait for so many pages before
   // scavenging again.  With 4K pages, this comes to 16MB of memory.
   static const size_t kDefaultReleaseDelay = 1 << 8;
-#endif
 
   // Find index of free list to scavenge
   size_t index = scavenge_index_ + 1;
@@ -2315,11 +2302,7 @@ void TCMalloc_PageHeap::IncrementalScavenge(Length n) {
       s->decommitted = true;
       DLL_Prepend(&slist->returned, s, entropy);
 
-#if PLATFORM(IOS)
-      scavenge_counter_ = std::max<size_t>(16UL, std::min<size_t>(kDefaultReleaseDelay, kDefaultReleaseDelay - (free_pages_ / kDefaultReleaseDelay)));
-#else
       scavenge_counter_ = std::max<size_t>(64UL, std::min<size_t>(kDefaultReleaseDelay, kDefaultReleaseDelay - (free_pages_ / kDefaultReleaseDelay)));
-#endif
 
       if (index == kMaxPages && !DLL_IsEmpty(&slist->normal, entropy))
         scavenge_index_ = index - 1;