Fix linux/gcc compiler warnings in tools/ipc_fuzzer.

It's really sad when your ASCII art breaks the compilation, but ending
a //-style comment line with a \ means the comment continues and this is
flagged as a bad thing (tm).

The other change is a signed/unsigned comparison, which is OK because it
is range checked prior to casting.

BUG=

Review URL: https://codereview.chromium.org/115673002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241109 0039d316-1c4b-4281-b951-d872f2087c98

tools/ipc_fuzzer/message_lib/message_file_format.h

@@ -26,8 +26,8 @@
 // | ...                    |
 // |------------------------|
 // | type = 0x0002070f      |
-// | string_table_offset = ---.
-// |------------------------|  \
+// | string_table_offset = ----+
+// |------------------------|  |
 // | ...                    |  |
 // |========================|  |
 // | message name           |  |
@@ -35,8 +35,8 @@
 // | message name           |  |
 // |------------------------|  |
 // | ...                    |  |
-// |------------------------|  /
-// | "ViewHostMsg_OpenURL" <--*
+// |------------------------|  |
+// | "ViewHostMsg_OpenURL" <---+
 // |------------------------|
 // | ...                    |
 // |========================|

tools/ipc_fuzzer/message_lib/message_file_writer.cc

@@ -79,7 +79,7 @@ bool Writer::WriteBlob(const void *buffer, size_t size) {
     return false;
   const char* char_buffer = static_cast<const char*>(buffer);
   int ret = base::WritePlatformFileAtCurrentPos(file_, char_buffer, size);
-  if (ret != size) {
+  if (ret != static_cast<int>(size)) {
     LOG(ERROR) << "Failed to write " << size << " bytes.";
     return false;
   }