Revert 114059 - Fixed service side implementation of glTexStorage2DEXT to only initialize the num...

Revert 114059 - Fixed service side implementation of glTexStorage2DEXT to only initialize the number of
levels requirested. Also ClearLevel now uses glTexSubImage2D to clear the level if the
texture is immutable.  Finally, rearranged the code in doTexSubImage2D to correctly
bypass clearing a level if the bitmaps supplied matches the dimensions of the texture level.
BUG=106894
Review URL: http://codereview.chromium.org/8872061

Reverting as it may be causing a failure in the XP perf bots:
http://build.chromium.org/p/chromium.perf/builders/XP%20Perf%20%28dbg%29/builds/6854

[email protected]
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=114133