Revert "GWP-ASan: Add Linux crash handler support"

This reverts commit 70034734.

Reason for revert: crbug.com/962875

Original change's description:
> GWP-ASan: Add Linux crash handler support
> 
> Linux crashpad support is now sufficiently enabled to allow running the
> GWP-ASan crash handler unit tests under Linux. (The client tests are
> still blocked on allocator shim updates.)
> 
> Change-Id: I409cebaa9cdaed5da546266d0af470d2b25a09ab
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610605
> Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
> Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
> Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#659296}

TBR=vtsyrklevich@chromium.org,vitalybuka@chromium.org

Change-Id: Idc53070073192a7a02260fe62c6a8514f2b1179c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611599Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659439}

components/gwp_asan/BUILD.gn

@@ -8,9 +8,9 @@ source_set("unit_tests") {
     "//components/gwp_asan/common:unit_tests",
   ]
   if (is_win || is_mac) {
-    deps += [ "//components/gwp_asan/client:unit_tests" ]
-  }
-  if (is_win || is_mac || is_linux) {
-    deps += [ "//components/gwp_asan/crash_handler:unit_tests" ]
+    deps += [
+      "//components/gwp_asan/client:unit_tests",
+      "//components/gwp_asan/crash_handler:unit_tests",
+    ]
   }
 }

components/gwp_asan/crash_handler/BUILD.gn

@@ -8,7 +8,6 @@ static_library("crash_handler") {
   sources = [
     "crash_analyzer.cc",
     "crash_analyzer.h",
-    "crash_analyzer_linux.cc",
     "crash_analyzer_mac.cc",
     "crash_analyzer_win.cc",
     "crash_handler.cc",

components/gwp_asan/crash_handler/crash_analyzer_linux.cc

-// Copyright 2019 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "components/gwp_asan/crash_handler/crash_analyzer.h"
-
-#include <signal.h>
-
-#include "third_party/crashpad/crashpad/snapshot/exception_snapshot.h"
-
-namespace gwp_asan {
-namespace internal {
-
-crashpad::VMAddress CrashAnalyzer::GetAccessAddress(
-    const crashpad::ExceptionSnapshot& exception) {
-  if (exception.Exception() != SIGSEGV && exception.Exception() != SIGBUS)
-    return 0;
-
-  return exception.ExceptionAddress();
-}
-
-}  // namespace internal
-}  // namespace gwp_asan

components/gwp_asan/crash_handler/crash_handler_unittest.cc

@@ -270,15 +270,13 @@ class CrashHandlerTest : public base::MultiProcessTest,
 
     EXPECT_TRUE(proto_.has_allocation());
     EXPECT_TRUE(proto_.allocation().has_thread_id());
-    EXPECT_NE(proto_.allocation().thread_id(),
-              static_cast<uint64_t>(base::kInvalidThreadId));
+    EXPECT_NE(proto_.allocation().thread_id(), base::kInvalidThreadId);
     EXPECT_GT(proto_.allocation().stack_trace_size(), 0);
 
     EXPECT_EQ(proto_.has_deallocation(), has_deallocation);
     if (has_deallocation) {
       EXPECT_TRUE(proto_.deallocation().has_thread_id());
-      EXPECT_NE(proto_.deallocation().thread_id(),
-                static_cast<uint64_t>(base::kInvalidThreadId));
+      EXPECT_NE(proto_.deallocation().thread_id(), base::kInvalidThreadId);
       EXPECT_EQ(proto_.allocation().thread_id(),
                 proto_.deallocation().thread_id());
       EXPECT_GT(proto_.deallocation().stack_trace_size(), 0);