This is in preparation for switching the exception handling in
chrome_elf from breakpad to crashpad. I will do that in a subsequent
patch.

This patch contains the following changes.
1. base
   Changes here are to restrict the usage of FilePath and file_util from
   the portions of the base which are referenced by crashpad and
   ChromeCrashReporterClient. These in turn end up bringing in
   dependencies on message_loop which won't work in chrome_elf.  Fixed
   logging.cc to not use file path and file util and instead use Windows
   API's to achieve the same result.  Fixed platform_thread_win.cc to
   avoid using windows_version.h as that pulls in object watcher and
   other badness.

2. crash_pad_win.cc. Remove usage of PathService and avoid using
   startup_metric_utils. That pulls in registry.h which in turn pulls in
   object watcher.

3. ChromeCrashReporterClient (Windows).
   Removed usage of chrome::RegisterChromeCrashKeys and instead locally
   defined a smaller version of that function. I added a TODO at the top
   here to remove these functions and the RegisterKeys function from the
   CrashClient interface, whenever scottmg's patch which avoids pre
   registration of crash keys lands. I also added a static function
   InitializeCrashReportingForProcess to this class which does the work
   for registering the process with crashpad.

4. install_static.
   Added some constants to this library and a new function
   GetSwitchValueFromCommandLine to retrieve the value of a switch from
   the command line.  This is to avoid depending on shell32 via base
   command line. Added a unittest for this function.

5. base\message_loop\message_pump_win.cc
   This file gets pulled in by users of platform_thread_win.cc which is
   used indirectly by lots of base code. This line
   tracked_objects::ThreadData::InitializeThreadContext(name); brings in
   the deps via TRACE_EVENT. I changed the deps to function pointers
   with CHECKs for user32 being loaded and the function pointers being
   valid to catch these in the wild.

BUG=604923
TEST=InstallStaticTest.GetSwitchValueFromCommandLineTest

Review-Url: https://codereview.chromium.org/2053953002
Cr-Commit-Position: refs/heads/master@{#400278}