remove valgrind checks from //content

We have not supported valgrind for some time (it was never ported to
the GN build IIUC, and has been obsoleted by ASan/MSan/TSan).

BUG=791518

Change-Id: Id24289347d0811ed51a0b9ac036c746ef18bf75f
Reviewed-on: https://chromium-review.googlesource.com/809426Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Mostyn Bramley-Moore <mostynb@vewd.com>
Cr-Commit-Position: refs/heads/master@{#522045}

content/common/child_process_host_impl.cc

@@ -19,7 +19,6 @@
 #include "base/rand_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/synchronization/lock.h"
-#include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "content/public/common/bind_interface_helpers.h"
@@ -62,10 +61,7 @@ base::FilePath ChildProcessHost::GetChildPath(int flags) {
 #if defined(OS_LINUX)
   // Use /proc/self/exe rather than our known binary path so updates
   // can't swap out the binary from underneath us.
-  // When running under Valgrind, forking /proc/self/exe ends up forking the
-  // Valgrind executable, which then crashes. However, it's almost safe to
-  // assume that the updates won't happen while testing with Valgrind tools.
-  if (child_path.empty() && flags & CHILD_ALLOW_SELF && !RunningOnValgrind())
+  if (child_path.empty() && flags & CHILD_ALLOW_SELF)
     child_path = base::FilePath(base::kProcSelfExe);
 #endif
 

content/test/blink_test_environment.cc

@@ -12,7 +12,6 @@
 #include "base/task_scheduler/task_scheduler.h"
 #include "base/test/scoped_task_environment.h"
 #include "base/test/test_discardable_memory_allocator.h"
-#include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "build/build_config.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/user_agent.h"
@@ -92,8 +91,6 @@ void TearDownBlinkTestEnvironment() {
   // http://code.google.com/p/chromium/issues/detail?id=9500
   test_environment->RunUntilIdle();
 
-  if (RunningOnValgrind())
-    blink::WebCache::Clear();
   delete test_environment;
   test_environment = nullptr;
 }