Linux perf integration with the new support for JIT.

src/base/platform/time.h

Index: src/base/platform/time.h
diff --git a/src/base/platform/time.h b/src/base/platform/time.h
index 29300e540445771969ad9d07df8270bf24739bae..c8140efe4a50ba9a23802267adeba271400f20b0 100644
--- a/src/base/platform/time.h
+++ b/src/base/platform/time.h
@@ -318,13 +318,6 @@ class TimeTicks final {
   // Returns true if the high-resolution clock is working on this system.
   static bool IsHighResolutionClockWorking();
 
-  // Returns Linux kernel timestamp for generating profiler events. This method
-  // returns null TimeTicks if the kernel cannot provide the timestamps (e.g.,
-  // on non-Linux OS or if the kernel module for timestamps is not loaded).
-
-  static TimeTicks KernelTimestampNow();
-  static bool KernelTimestampAvailable();
-
   // Returns true if this object has not been initialized.
   bool IsNull() const { return ticks_ == 0; }