Remove implicit conversions from scoped_refptr to T* in base/

This patch was generated by running the rewrite_scoped_refptr clang tool
on a Linux build.

BUG=110610

Review URL: https://codereview.chromium.org/510563002

Cr-Commit-Position: refs/heads/master@{#292050}

base/debug/trace_event_impl.cc

@@ -1786,7 +1786,7 @@ void TraceLog::FinishFlush(int generation) {
 void TraceLog::FlushCurrentThread(int generation) {
   {
     AutoLock lock(lock_);
-    if (!CheckGeneration(generation) || !flush_message_loop_proxy_) {
+    if (!CheckGeneration(generation) || !flush_message_loop_proxy_.get()) {
       // This is late. The corresponding flush has finished.
       return;
     }
@@ -1796,7 +1796,7 @@ void TraceLog::FlushCurrentThread(int generation) {
   delete thread_local_event_buffer_.Get();
 
   AutoLock lock(lock_);
-  if (!CheckGeneration(generation) || !flush_message_loop_proxy_ ||
+  if (!CheckGeneration(generation) || !flush_message_loop_proxy_.get() ||
       thread_message_loops_.size())
     return;
 
@@ -1808,7 +1808,7 @@ void TraceLog::FlushCurrentThread(int generation) {
 void TraceLog::OnFlushTimeout(int generation) {
   {
     AutoLock lock(lock_);
-    if (!CheckGeneration(generation) || !flush_message_loop_proxy_) {
+    if (!CheckGeneration(generation) || !flush_message_loop_proxy_.get()) {
       // Flush has finished before timeout.
       return;
     }

base/files/important_file_writer.cc

@@ -169,7 +169,7 @@ bool ImportantFileWriter::PostWriteTask(const std::string& data) {
   // using PostTask() in the typical scenario below.
   if (!on_next_successful_write_.is_null()) {
     return base::PostTaskAndReplyWithResult(
-        task_runner_,
+        task_runner_.get(),
         FROM_HERE,
         MakeCriticalClosure(
             Bind(&ImportantFileWriter::WriteFileAtomically, path_, data)),

base/prefs/json_pref_store.cc

@@ -282,7 +282,7 @@ void JsonPrefStore::ReadPrefsAsync(ReadErrorDelegate* error_delegate) {
 
   // Weakly binds the read task so that it doesn't kick in during shutdown.
   base::PostTaskAndReplyWithResult(
-      sequenced_task_runner_,
+      sequenced_task_runner_.get(),
       FROM_HERE,
       base::Bind(&ReadPrefsFromDisk, path_, alternate_path_),
       base::Bind(&JsonPrefStore::OnFileRead, AsWeakPtr()));