Revert "Implement __cxa_pure_virtual to avoid undefined symbol error"

This reverts commit 79fc11a5.

Reason for revert: Broke android-archive-rel build.
https://ci.chromium.org/p/chromium/builders/ci/android-archive-rel/7634

Original change's description:
> Implement __cxa_pure_virtual to avoid undefined symbol error
> 
> "undefined symbol: __cxa_pure_virtual" will happen when building
> //base/android/linker:chromium_android_linker with
> use_clang_coverage = true
> 
> It seems we can use infinite loop to avoid this error:
> https://stackoverflow.com/questions/920500/what-is-the-purpose-of-cxa-pure-virtual
> 
> 
> Bug: 1018780
> Change-Id: I97cc0a495320c4ede1ecd43cf1b7816b58646960
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1968050
> Commit-Queue: Yun Liu <yliuyliu@google.com>
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#726178}

TBR=digit@chromium.org,rmcilroy@chromium.org,yliuyliu@google.com

Change-Id: Ia68fbab2f43bed74b8e134397973b83dcc5bf6e8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1018780
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974294Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726183}

third_party/android_crazy_linker/README.chromium

@@ -105,5 +105,3 @@ Local Modifications:
 - Add a document about testing the crazy linker in a Chromium checkout
 
 - Remove unnecessary alignment check for size of area that is about to mmap(2).
-
-- Implement __cxa_pure_virtual to avoid undefined symbol error.

third_party/android_crazy_linker/src/src/crazy_linker_debug.cpp

@@ -6,7 +6,6 @@
 
 #include <errno.h>
 #include <string.h>
-#include <unistd.h>
 
 #ifdef __ANDROID__
 #include <android/log.h>
@@ -18,16 +17,6 @@
 
 namespace crazy {
 
-// Log fatal error and exit.
-void LogFatalAndExit(const char* message) {
-#ifdef __ANDROID__
-  __android_log_write(ANDROID_LOG_FATAL, "crazy_linker", message);
-#else
-  ::write(STDERR_FILENO, message, sizeof(message) - 1);
-#endif
-  _exit(1);
-}
-
 #if CRAZY_DEBUG
 
 namespace {

third_party/android_crazy_linker/src/src/crazy_linker_debug.h

@@ -29,9 +29,6 @@ template <bool> struct CompileAssert { };
 
 namespace crazy {
 
-// Log fatal error and exit.
-void LogFatalAndExit(const char* message);
-
 #if CRAZY_DEBUG
 
 void Log(const char* location, const char* fmt, ...);

third_party/android_crazy_linker/src/src/crazy_linker_shared_library.cpp

@@ -59,12 +59,6 @@
 #define DT_PREINIT_ARRAYSZ 33
 #endif
 
-// Avoid undefined symbol:__cxa_pure_virtual error.
-extern "C" void __cxa_pure_virtual() {
-  static const char kFatalMessage[] = "Pure virtual function was called!";
-  crazy::LogFatalAndExit(kFatalMessage);
-}
-
 namespace crazy {
 
 namespace {

third_party/android_crazy_linker/src/src/crazy_linker_system.cpp

@@ -14,7 +14,6 @@
 #include <android/log.h>
 #endif
 
-#include "crazy_linker_debug.h"
 #include "crazy_linker_util.h"
 
 // Note: unit-testing support files are in crazy_linker_files_mock.cpp
@@ -200,7 +199,12 @@ void* operator new(size_t size) {
   // runtime. Hence our fatal message does not contain the number of
   // bytes requested by the allocation.
   static const char kFatalMessage[] = "Out of memory!";
-  crazy::LogFatalAndExit(kFatalMessage);
+#ifdef __ANDROID__
+  __android_log_write(ANDROID_LOG_FATAL, "crazy_linker", kFatalMessage);
+#else
+  ::write(STDERR_FILENO, kFatalMessage, sizeof(kFatalMessage) - 1);
+#endif
+  _exit(1);
 #if defined(__GNUC__)
   __builtin_unreachable();
 #endif