[ChromeDriver] Change location of browser snapshots

The directory names in chromium-browser-snapshots bucket have
changed recently, breaking all ChromeDriver builds. Changing
ChromeDriver waterfall script to compensate. In particular,
the following directory names have changed:

    Win -> win32_rel
    Mac -> mac_rel
    Linux_x64 -> linux_rel

Also removing obsolete code for 32-bit Linux.

TBR=crouleau@chromium.org

Change-Id: I2927152abc91a097fbb3c50693a578eaecc44752
Reviewed-on: https://chromium-review.googlesource.com/1157908Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579695}

chrome/test/chromedriver/archive.py

@@ -21,7 +21,6 @@ CR_REV_URL = 'https://cr-rev.appspot.com/_ah/api/crrev/v1/redirect/%s'
 
 class Site(object):
   CHROMIUM_SNAPSHOT = _SITE + '/chromium-browser-snapshots'
-  CHROMIUM_LINUX = _SITE + '/chromium-linux-archive/chromium.linux'
 
 
 def GetLatestRevision():
@@ -51,10 +50,7 @@ def DownloadChrome(revision, dest_dir, site=Site.CHROMIUM_SNAPSHOT):
     elif util.IsMac():
       return revision + '/chrome-mac.zip'
     elif util.IsLinux():
-      if util.Is64Bit():
-        return revision + '/chrome-linux.zip'
-      else:
-        return 'full-build-linux_' + revision + '.zip'
+      return revision + '/chrome-linux.zip'
 
   def GetDirName():
     if util.IsWindows():
@@ -62,10 +58,7 @@ def DownloadChrome(revision, dest_dir, site=Site.CHROMIUM_SNAPSHOT):
     elif util.IsMac():
       return 'chrome-mac'
     elif util.IsLinux():
-      if util.Is64Bit():
-        return 'chrome-linux'
-      else:
-        return 'full-build-linux'
+      return 'chrome-linux'
 
   def GetChromePathFromPackage():
     if util.IsWindows():
@@ -87,31 +80,22 @@ def DownloadChrome(revision, dest_dir, site=Site.CHROMIUM_SNAPSHOT):
 def _GetDownloadPlatform():
   """Returns the name for this platform on the archive site."""
   if util.IsWindows():
-    return 'Win'
+    return 'win32_rel'
   elif util.IsMac():
-    return 'Mac'
+    return 'mac_rel'
   elif util.IsLinux():
-    if util.Is64Bit():
-      return 'Linux_x64'
-    else:
-      return 'Linux Builder (dbg)(32)'
+    return 'linux_rel'
 
 
 def GetLatestSnapshotPosition():
   """Returns the latest commit position of snapshot build."""
   latest_revision = GetLatestRevision()
-  if util.IsLinux() and not util.Is64Bit():
-    return GetCommitPositionFromGitHash(latest_revision)
-  else:
-    return latest_revision
+  return latest_revision
 
 
 def GetDownloadSite():
   """Returns the site to download snapshot build according to the platform."""
-  if util.IsLinux() and not util.Is64Bit():
-    return Site.CHROMIUM_LINUX
-  else:
-    return Site.CHROMIUM_SNAPSHOT
+  return Site.CHROMIUM_SNAPSHOT
 
 
 def GetCommitPositionFromGitHash(snapshot_hashcode):